sap-abap-cds

SAP ABAP CDS (Core Data Services)

Related Skills

• sap-abap: Use for ABAP programming patterns used with CDS or when implementing EML statements in ABAP
• sap-btp-cloud-platform: Use for CDS deployment scenarios on BTP or ABAP Environment configurations
• sap-fiori-tools: Use when building Fiori Elements applications that consume CDS views or working with UI annotations
• sap-cap-capire: Use for comparing CDS syntax between ABAP and CAP or when integrating ABAP CDS with CAP services
• sap-api-style: Use when documenting CDS-based OData services or following API documentation standards

When to Use This Skill

Use this skill when creating ABAP CDS views or view entities, defining associations and cardinalities, adding UI or semantic annotations, implementing DCL access control, handling currency/unit fields, troubleshooting CDS compiler errors, or comparing classic CDS views with newer view entities.

Quick Reference: https://help.sap.com/doc/abapdocu_cp_index_htm/CLOUD/en-US/abencds.html | SAP Cheat Sheets: https://github.com/SAP-samples/abap-cheat-sheets/blob/main/15_CDS_View_Entities.md

Version Compatibility

This skill covers CDS features from 7.40 SP8 through ABAP Cloud. Key version boundaries:

On a 7.40 system: Use DEFINE VIEW (not DEFINE VIEW ENTITY). CDS table functions are not available before 7.50. Basic DCL (DEFINE ROLE with pfcg_auth) is available from 7.40 SP08, but implicit role evaluation in ABAP SQL requires 7.50+. $session.user/client/system_language are available from 7.40 SP08. The templates in templates/ include both classic CDS View and View Entity variants.

Table of Contents

• 1. CDS View Fundamentals
• 2. Essential Annotations
• 3. Expressions and Operations
• 4. Built-in Functions
• 5. Joins
• 6. Associations
• 7. Input Parameters
• 8. Aggregate Expressions
• 9. Access Control (DCL)
• 10. Data Retrieval from ABAP
• 11. Common Errors and Solutions
• 12. Useful Transactions and Tables
• Bundled Resources
• Source Documentation

1. CDS View Fundamentals

View Types

Recommendation: Use CDS View Entities for new development.

Basic CDS View Syntax

@AbapCatalog.sqlViewName: 'ZCDS_EXAMPLE_V'
@AbapCatalog.compiler.CompareFilter: true
@AccessControl.authorizationCheck: #NOT_REQUIRED
@EndUserText.label: 'Example CDS View'

define view ZCDS_EXAMPLE
  as select from db_table as t
{
  key t.field1,
      t.field2,
      t.field3 as AliasName
}

CDS View Entity Syntax (7.55+)

@AccessControl.authorizationCheck: #NOT_REQUIRED
@EndUserText.label: 'Example View Entity'

define view entity Z_CDS_EXAMPLE
  as select from db_table as t
{
  key t.field1,
      t.field2,
      t.field3 as AliasName
}

Key Difference: View entities omit @AbapCatalog.sqlViewName - no SQL view generated.

Eclipse ADT Setup

1. File → New → Other → Core Data Services → Data Definition
2. Enter name, description, and package
3. Select template (view, view entity, etc.)

2. Essential Annotations

Core Annotations

Essential annotations for CDS development:

• @AbapCatalog.sqlViewName - SQL view name (max 16 chars)
• @AbapCatalog.compiler.CompareFilter - Optimize WHERE clauses
• @AccessControl.authorizationCheck - Set to #NOTREQUIRED, #CHECK, #MANDATORY, or #NOTALLOWED
• @EndUserText.label - User-facing description
• @Metadata.allowExtensions - Allow view extensions

Complete Reference: See references/annotations-reference.md for 50+ annotations with examples.

Semantics Annotations (Currency/Quantity)

Required for CURR and QUAN data types to avoid error SDCDSENTITY105:

-- Currency fields
@Semantics.currencyCode: true
waers,
@Semantics.amount.currencyCode: 'waers'
amount,

-- Quantity fields
@Semantics.unitOfMeasure: true
meins,
@Semantics.quantity.unitOfMeasure: 'meins'
quantity

UI Annotations (Fiori Elements)

@UI.lineItem: [{ position: 10 }]
@UI.identification: [{ position: 10 }]
@UI.selectionField: [{ position: 10 }]
field1,

@UI.hidden: true
internal_field

Consumption Annotations (Value Help)

@Consumption.valueHelpDefinition: [{
  entity: { name: 'I_Currency', element: 'Currency' }
}]
waers

For complete annotation reference, see references/annotations-reference.md.

3. Expressions and Operations

CASE Expressions

Simple CASE (single variable comparison):

case status
  when 'A' then 'Active'
  when 'I' then 'Inactive'
  else 'Unknown'
end as StatusText

Searched CASE (multiple conditions):

case
  when amount > 1000 then 'High'
  when amount > 100 then 'Medium'
  else 'Low'
end as AmountCategory

Comparison Operators

Standard operators: =, <>, <, >, <=, >= Special operators: BETWEEN x AND y, LIKE, IS NULL, IS NOT NULL

Complete Reference: See references/expressions-reference.md for all operators and expressions.

Arithmetic Operations

quantity * price as TotalAmount,
amount / 100 as Percentage,
-amount as NegatedAmount

Session Variables

Available system variables (SY fields equivalent):

• $session.user (SY-UNAME) - Current user [7.40 SP08+]
• $session.client (SY-MANDT) - Client [7.40 SP08+]
• $session.system_language (SY-LANGU) - Language [7.40 SP08+]
• $session.system_date (SY-DATUM) - Current date [7.51+]

Note: $session.user/client/system_language are available from 7.40 SP08. $session.system_date requires 7.51+. @Environment.systemField requires 7.50+.

Complete Reference: See references/expressions-reference.md for all system variables.

$session.user as CurrentUser,
$session.system_date as Today

4. Built-in Functions

CDS provides comprehensive built-in functions for string, numeric, and date operations.

Key Function Categories

• String Functions: concat(), length(), substring(), upper(), lower(), replace()
• Numeric Functions: abs(), ceil(), floor(), round(), division()
• Date Functions: datsadddays(), datsaddmonths(), datsdaysbetween()
• CAST Expression: Convert between ABAP data types

Note: upper() and lower() in CDS require 7.51+. On 7.40/7.50, case conversion must be performed in ABAP after selecting (there is no CDS equivalent).

Complete Reference: See references/functions-reference.md for all 50+ functions with examples.

Quick Examples

-- String operations
concat(first_name, last_name) as FullName,
upper(name) as UpperName,
substring(description, 1, 10) as ShortDesc

-- Numeric operations  
abs(amount) as AbsoluteAmount,
round(value, 2) as RoundedValue,
division(10, 3, 2) as PreciseDivision

-- Date operations
dats_add_days(current_date, 7) as NextWeek,
dats_days_between(start_date, end_date) as Duration

-- Type conversion
cast(field as abap.char(10)) as TextField,
cast(amount as abap.curr(15,2)) as CurrencyField

**ABAP Types**: `abap.char()`, `abap.numc()`, `abap.int4`, `abap.dats`, `abap.tims`, `abap.curr()`, `abap.cuky`, `abap.quan()`, `abap.unit()`

---

## 5. Joins

### Join Types

-- INNER JOIN (matching rows only) inner join makt as t on m.matnr = t.matnr

-- LEFT OUTER JOIN (all from left, matching from right) left outer join marc as c on m.matnr = c.matnr

-- RIGHT OUTER JOIN (all from right, matching from left) -- [7.51+] right outer join mvke as v on m.matnr = v.matnr

-- CROSS JOIN (cartesian product) -- [7.51+] cross join t001 as co

---

## 6. Associations

Associations define relationships between entities (join-on-demand):

### Defining Associations

define view ZASSOCEXAMPLE as select from scarr as c association [1..*] to spfli as Flights on $projection.carrid = Flights.carrid association [0..1] to sairport as Airport on $projection.hub = Airport.id { key c.carrid, c.carrname, c.hub,

// Expose associations Flights, Airport }

### Cardinality Notation

**Syntax mapping**:
- `[0..1]` or `[1]` → `association to one` (LEFT OUTER MANY TO ONE)
- `[1..1]` → `association to one` (exact match)
- `[0..*]` or `[*]` → `association to many` (LEFT OUTER MANY TO MANY)
- `[1..*]` → `association to many` (one or more)

**Complete Reference**: See `references/associations-reference.md` for detailed cardinality guide.

### New Cardinality Syntax (Release 2302+)

association to one Customer on ... -- [0..1] association to many Items on ... -- [0..*]

### Using Associations

-- Expose for consumer use _Customer,

-- Ad-hoc field access (triggers join) _Customer.name as CustomerName

### Path Expressions with Filter

-- Filter with cardinality indicator _Items[1: Status = 'A'].ItemNo

For complete association reference, see `references/associations-reference.md`.

---

## 7. Input Parameters

### Defining Parameters

define view ZPARAMEXAMPLE with parameters pdatefrom : dats, pdateto : dats, @Environment.systemField: #SYSTEMLANGUAGE plangu : spras as select from vbak as v { key v.vbeln, v.erdat, v.erzet } where v.erdat between :pdatefrom and :pdateto

### Parameter Reference
Use colon notation `:p_date_from` or `$parameters.p_date_from`

**Calling from ABAP**:

SELECT * FROM zparamexample( pdatefrom = '20240101', pdateto = '20241231', plangu = @sy-langu ) INTO TABLE @DATA(ltresult).

---

## 8. Aggregate Expressions

### Aggregate Functions

define view ZAGGEXAMPLE as select from vbap as i { i.vbeln, sum(i.netwr) as TotalAmount, avg(i.netwr) as AvgAmount, max(i.netwr) as MaxAmount, min(i.netwr) as MinAmount, count(*) as ItemCount } group by i.vbeln having sum(i.netwr) > 1000

---

## 9. Access Control (DCL)

### Basic DCL Structure

@MappingRole: true define role ZCDSEXAMPLEDCL { grant select on ZCDSEXAMPLE where (bukrs) = aspect pfcgauth(FBKPFBUK, BUKRS, ACTVT = '03'); }

### Authorization Check Options

**Available values**:
- `#NOT_REQUIRED` - No authorization check
- `#CHECK` - Warning if no DCL exists
- `#MANDATORY` - Error if no DCL exists
- `#NOT_ALLOWED` - DCL ignored if exists

**Complete Reference**: See `references/access-control-reference.md` for detailed DCL patterns.

### Condition Types

**PFCG Authorization**: `where (field) = aspect pfcg_auth(AUTH_OBJECT, AUTH_FIELD, ACTVT = '03')`

**Literal Condition**: `where status <> 'DELETED'`

**User Aspect**: `where created_by ?= aspect user`

**Combined**: `where (bukrs) = aspect pfcg_auth(...) and status = 'ACTIVE'`

For complete access control reference, see `references/access-control-reference.md`.

---

## 10. Data Retrieval from ABAP

### Standard SELECT

SELECT * FROM zcdsexample WHERE field1 = @lvvalue INTO TABLE @DATA(lt_result).

### SALV IDA (Integrated Data Access)

clsalvguitableida=>createforcdsview( CONV #( 'ZCDSEXAMPLE' ) )->fullscreen( )->display( ).

---

## 11. Common Errors and Solutions

### SD_CDS_ENTITY105: Missing Reference Information

**Problem**: CURR/QUAN fields without reference

**Solution**: Add semantics annotations

@Semantics.currencyCode: true waers, @Semantics.amount.currencyCode: 'waers' netwr

Or import currency from related table:

inner join t001 as c on ... { c.waers, @Semantics.amount.currencyCode: 'waers' v.amount }

### Cardinality Warnings

**Problem**: Cardinality doesn't match actual data

**Solution**: Define cardinality matching data model

association [0..1] to ... -- Use for optional relationships association [1..*] to ... -- Use for required one-to-many

For complete troubleshooting guide, see `references/troubleshooting.md`.

---

## 12. Useful Transactions and Tables

### Key Transactions
- **SDDLAR** - Display/repair DDL structures
- **RSRTS_ODP_DIS** - TransientProvider preview
- **RSRTS_QUERY_CHECK** - CDS query metadata validation
- **SE63** - Translation (EndUserText)
- **SE11** - ABAP Dictionary
- **SU21** - Authorization objects

### Important Tables
- **DDHEADANNO** - Header-level annotations
- **CDSVIEWANNOPOS** - CDS view header annotations
- **CDS_FIELD_ANNOTATION** - Field-level annotations
- **ABDOC_CDS_ANNOS** - SAP annotation definitions

### API Class
`CL_DD_DDL_ANNOTATION_SERVICE` - Programmatic annotation access:
- `get_annos()` - Get all annotations
- `get_label_4_element()` - Get @EndUserText.label

---

## Bundled Resources

### Reference Documentation
For detailed guidance, see the reference files in `references/`:

- `annotations-reference.md` - Complete annotation catalog
- `functions-reference.md` - All built-in functions with examples
- `associations-reference.md` - Associations and cardinality guide
- `access-control-reference.md` - DCL and authorization patterns
- `expressions-reference.md` - Expressions and operators
- `troubleshooting.md` - Common errors and solutions

### Templates
For templates, see `templates/`:
- `basic-view.md` - Standard CDS view template
- `parameterized-view.md` - View with input parameters
- `dcl-template.md` - Access control definition

---

## Source Documentation

**Update this skill by checking**:
- https://help.sap.com/doc/abapdocu_cp_index_htm/CLOUD/en-US/abencds.html (ABAP Cloud)
- https://help.sap.com/doc/abapdocu_740_index_htm/7.40/en-US/index.htm (7.40 Reference)
- https://help.sap.com/docs/SAP_NETWEAVER_AS_ABAP_752/f2e545608079437ab165c105649b89db/7c078765ec6d4e6b88b71bdaf8a2bd9f.html (NetWeaver 7.52 User Guide)
- https://github.com/SAP-samples/abap-cheat-sheets
- https://github.com/SAP-samples/abap-cheat-sheets/blob/main/33_ABAP_Release_News.md (Release News)

**Last Verified**: 2026-04-02