Bizzare situation withn the "Where used list" for a table

Hello all,

I use the "where used list" (all check boxes selected) function in SE11 to find out where and how the table FMGLFLEXT (same for table FMGLFLEXA) is being used and updated. All I get is a reference to a function module, namely “G_POSTING_FMGLFLEXT”. When I do a "where used list" (once again, all check boxes selected) for the FM, I get the message: Function Module G_POSTING_FMGLFLEXT not found in selected search area Message no. ES120“ despite the fact that all check boxes are selected.

Yet this table contains data which were put in there via transaction FB50 (G/L Acct Pstg: Single Screen Trans.). So somehow, somewhere this data was created and put into the table.

I don’t get it! What am I missing?

Thank you for your help