Review: trace each stage of the business operation

An EML consumer sends an operation to a RAP BO, checks its responses, and follows the transaction’s save or rollback path. The business object—not the consumer’s guess—defines which fields and operations are available.

The quiz is original and educational. Its browser interaction does not connect to a RAP service or execute ABAP.

Sources

• SAP Samples: ABAP EML
• ABAP Keyword Documentation: RAP business object

Developer practice · ABAP

Practice: EML knowledge check

Answer these original review questions about using ABAP EML with RAP business objects.

1. What does EML access?

RAP business objects through their defined behaviorAny database table while bypassing behaviorThe browser's local storage

2. Where do the entity alias and available fields come from?

The RAP artifacts and behavior definitionA guessed naming conventionA JSON response

3. What does %cid identify?

A create operation's instance within an EML requestA permanent authorization roleA database index

4. Why is %control useful?

It indicates which fields are intentionally provided or requestedIt automatically commits the transactionIt defines the CDS table

5. What does FAILED communicate?

Which instances encountered operation failuresWhich rows were persisted for certainWhich columns are in the database

6. When does an EML consumer's change reach persistence?

When the RAP save sequence is triggered, commonly by COMMIT ENTITIESImmediately after any MODIFY ENTITIES statementWhen WRITE is called

7. What is the scope of ROLLBACK ENTITIES?

The current RAP transactionOnly the last component assignedEvery database table in the system

8. Should you update a RAP persistence table directly instead of using EML?

No; that can bypass the business object's behaviorYes; it is always equivalentOnly if the row has a string field

Check answers

Choose one answer for each question.