On your Inquiry definition, you have a inquiry window specified as DZOBJSPE, that window type is defined to be such that is incompatible with the use on the inquiry definition. The only type of window acceptable in the criteria window, is one with a window type of "Inquiry criteria", where you main window need to be just Window Type  "Inquiry"

Hi 

Thank you very much for your answer.

My inquiry window has window type "inquiry criteria" and the main window is of type "inquiry".

Despite the correctly set window types the error message "This inquiry code cannot be used in this function" comes up.

Kind regards

What does your function and linked action definition look like? Is the action type set to inquiry?

Thank you very much for your help.

My function and action definition looks like this:

The template in the action is set to inquiry. On the type field I have choosen miscellaneous. There is no option for inquiry.

Unfortunately I still get this error.

Kind regards

Thank you for all the images, on your criteria window add a fields called ECRAN, data type GTC. See the image above, for you to be able to use the criteria window over multiple customized inquiry windows, X3 need to know what the display window to use, hence the screen code. This should solve your problem as its the hard check within process SUBGTC.

Thank you very much :) The error no longer occurs after I added an ECRAN field of type GTC to the criteria mask. I set the number of lines in the function GESGTC to 200. But in the function there are still about 10000 lines shown. Probably I still have to write some custom code in the mask skript. So that only 200 lines will be shown and the back and next buttons works correctly. Maybe I have to look in some standard inquiry mask scripts for examples.