BAdI that fires in F-02 update task (AFTER U107 in YRGGBR000) ???

In Form U107 of YRGGBR000, I'm exporting some stuff to database memory.

I want to import this stuff in some BAdI that fires during the update task portion of F-02 (or FB01).

Shoudn't I be able to implement AC_DOCUMENT for this purpose. I know that ACC_DOCUMENT is only for BAPI, so that won't work.

But shouldn't AC_DOCUMENT work? Shouldn't an F-02 fall thru the SAP code that checks for an implementation of this BAPI?