Invalid Window ID -Error while Moving the FORM

[surfraz_urs]

Hi All ,

I have form A from which i am opening another form say Form B using FND_FUNCTION.EXECUTE .While form B is opened ,Form

A will remain open in the background ( Behind form B ). Whenever i move form B ,I am getting an Error Message

saying "Can not find Window. Invalid Window ID".

I am getting this error only when i try to move the Form B position.

Can anybody please tell me why this error is coming.

I am working Oracle Apps R12 Instance.

Thanks & Regards,
Surfraz Mitegar