Add a new field to exisitng generic Datasource in source: Table join source

Good day

I need guidance please?

Requirement: Add a new field to source and SAP BW for reporting purposes.

I need to add a debtors field from source table VBPA to an exisitng generic datasource in a source. The exisitng database view has several join conditions to different tables.

What are the step-by-step procedure to get a field added to this database view, using join conditions?

Thanks in advance


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