Sorry... but this way is not working since sap note 3164503: Support maintenance of custom fields created via the custom fields and logic app in the project system's mass processing transactionsBAPI_BUS2001_CHANGE is currently useless for update of c...

Hi,try it about the reference to "if_dpr_common":  DATA: lo_session_state    TYPE REF TO cl_dpr_session_state,             lo_common           TYPE REF TO if_dpr_common,             lo_manager          TYPE REF TO cl_dpr_appl_object_manager,         ...