Can you provide a sample extract or schema definition for the PO Header and PO Line DFFs that lists both the column names and their data types?
FscmTopModelAM.POLineDFFPublicBIAM.FLEX_BI_POLineDFFPublic_VI
FscmTopModelAM.POHeaderDFFPublicBIAM.FLEX_BI_POHeaderDFFPublic_VI