I've been doing this by trial and error but there must be some logic here

This works:

"EXEC sp_Update_Atmservice ?ln_transid, ?lc_orderstatus, ?lc_notes, ?oApp.gc_user"

This does not work:

"EXEC sp_Update_Atmservice ?ln_transid, ?thisform.lc_orderstatus, ?lc_notes, ?oApp.gc_user"

I'm wondering why the property oApp.gc_user is OK and the property thisform.lc_orderstatus is not.Both are character properties with character values in them.

In order to get the second line to work, I have to move thisform.lc_orderstatus into a memory variable and pass that thru.

What is the logic here?