Generic Delta Extraction using Function Module not working in Replication Flow

[AlexF_ukr]

Hello experts,
tell me how to fix custom Data Source in ECC so that Replicatin Flow works in Initial and Delta mode. 

Сustom Data Source in ECC created according to instructions
Generic Delta Extraction using Function Module alo... - SAP Community

In DataSphere error:

Thanks)

SAP Datasphere 

[Vitaliy-R]

Hi Alex. Could you please fix the formatting of your post with the question? It is difficult to read and understand. Thank you. --VR

[AlexF_ukr]

Sorry, my first post...fix the formatting

[maggie_yi]

Hi Alex, If your custom datasource doesn't have a key field (in table ROOSFIELD, no field has 'KEYFLAG DS = X'), then this datasource is only possible for load type initial only just as mentioned in the popup. If you want to enable delta for this datasource, you may append a field called PRIMARYKEY with rollname = PRIMARYKEY. Em... you may refer to the details in Note https://me.sap.com/notes/0003587890. In case you want to use a CDS view, please also check Note: https://me.sap.com/notes/3527268 Regards, Maggie

[AlexF_ukr]

I added the PRIMARYKEY field but I don't have the PRIMARYKEY data element so I chose another one. The result is still the same error in Replication FLOW

[michal_majer]

Hi Alex, Table / Data Source need to have defined Primary Key (not the filed with that name, but field(s) combination that will specify key. If it's not defined You have to use Initial Load or use Data Flows.

[AlexFil]

The question is how to define this Primary KEY for the extractor on FM? Perhaps you can suggest a standard Badi or T-code so as not to make a custom ABAP