In V12.0.21, and I'm trying to add lines via web services to POs that are partially closed, but I get the 'can't display a popup in webservices' error. It works on POs that are not partially closed, and it works when manually adding lines to the partially closed POs in X3. I tried it in a 12.0.23 environment and got the same error.
Curious to know if anyone has encountered this and what might be done.
Thanks.