Duplicate event

Hi experts,

this morning, we tested the Z-READY-FOR-PU Event. It is posting duplicate events with the app and ist posting one event with the sequence testing of BAPI /SAPTRX/BAPI_EH_ADDEVENTMSG_02 and BAPI_TRANSACTION_COMMIT. See screenshots. The difference with the app is that the "second" Event has no Location. What could be the reason that the Location is blank when posting with the app (2nd time)?

WRONG (with app)

CORRECT with test sequence

Thanks so much in advance. Its highly appreciated. Points will be rewarded quickly.

Petra