Map ERP-GBDAT to C4C-BirtDate on Cloud Integration

Hello Dear Community,

I am using standard business partner integration between ERP and C4C.

I need to get KNVK-GBDAT field from ERP to C4C BirthDate.

When I trace integration GBDAT data comes into the integration flow from ERP but is not passed to the target message after mapping.

Have you got any ideas about possible causes?

Best Regards.

Sandro