Automatocally propose WT to Infotype 8 TC during run-time

Good evening, Gurus!

I m trying to propose lgarts during run-time in infotype 8.

I am trying to do this through PA40 tcode, but the lgart that I calculate and add to the TC (table TBLGART), although it is visible when on MP0008 dynpro, is not stored in PA0008 once I save the record and return to Module Pool first dynpro.

It should be an error by my side, but I do not understand where to operate to solve this.

However I have tryied to insert the lgart I need using a debugged section but still no results.

Where am I wrong?

Many thanks in advance

Regards

alpanix