Substitution in FI. Field Order

Hi:

I need to clear the orden number ( BSEG-AUFNR) during a substitution in FI.

I created the condition and the rule substitution a item level like that:

Condition: BSEG-HKONT >= '600000000' AND

BSEG-HKONT <= '699999999'

Substitution Field AUFNR replaced by a constant value equal to empty.

The simulation works, but the accounting registry doesn´t work.

Thanks pour helps.