SETFOCUS error in MODAL window

[valt...@valtecom.com.br]

Good morning, group friends,
I'm facing a mystery. In any window, if I open a MODAL window and, after performing the procedures in that MODAL window and pressing the return key that should position the cursor on the control positioned when the window was opened, it doesn't position or focus on the previous window.
For example, in a sales window, with the cursor positioned on the control where the user enters the product code, if the user opens the MODAL window to search for the product and selects the product, then closes the MODAL window (productsearchwindow.RELEASE), the cursor should return to the control that was positioned in the previous window and to the product code control where it was before, but it doesn't position itself. It gets lost and doesn't even activate the previous window. It's even programmed to force positioning with the command: saleswindow.txproductcode.SETFOCUS.
Has anyone experienced this situation?
The MODAL window is very useful for preventing users from getting lost in CHILD-type windows.
Thank you. Valteçom
Uberaba, MG, Brazil