need advice regarding disable the save button for SO

hi there Gurus,

thanks for the helps that you have given me.

i have a new issue, where i was ask to change the information message to an error message in the SO creation va01. i have done that.

but now the user wants me to disable the save button if the error message that i set appears.

i have done the changes in this program FV45SFST_STRUKTUR_ANLEGEN_POSI

this were the changes that i did

if da_subrc > 0.

if product_selection_rekursiv eq space.

*{ REPLACE DM2K909203 1

*\ message i003(v2) with vbap-matnr.

• insert it in global MV45ATOP data: errorstatus type c.

message e003(v2) with vbap-matnr.

• errorstatus = '1'.

now im trying to figure out how to set the save button disable when the error message appears.

this is a bit urgent, can any one please guide me in this.

thanks.