How to set the fields invisible/visible dynamically with screen-exits

Goal: I am changing the subscreen from standard screen for mobile device interface, i.e. function group LMOB. With a scanner I am to read a material number and have it confirmed by the SAP system. For this I need an input field which is already supplied by the standard program. The users require the screen to be dynamic, i.e. I can not do the settings in the screen-painter.
Problem occurred: After I have changed to use the customized subscreen 1202 in function group XLRF, not all the fields are displayed. It seems that the values for setting the screen elements are lost when calling the subscreen (3202, copy of screen 2202). For instance, it does not show my input field. Somewhere there need to be a list that contains all these parameter switches? I know how Loop at screen works but cant find the values that are supposed to be passed over to the subscreen.
Would be grateful for some help.

Hi Niklas!
Unfortunately I don't know the transaction you're working on, but I had a similar problem once.
You have to use the commands LOOP AT SCREEN and MODIFY SCREEN. I found some online help here: <a href="http://help.sap.com/saphelp_470/helpdata/en/9f/dba70535c111d1829f0000e829fbfe/frameset.htm">SAP Online Help</a>. The fields of the pseudo-table SCREEN can be found here: <a href="http://help.sap.com/saphelp_470/helpdata/en/9f/dbab6f35c111d1829f0000e829fbfe/frameset.htm">SAP Online Help</a>. I think you have to set INVISIBLE to 'X' - but you may have to experiment.
Another thing to look out for is that you have to call this method in the PBO section of the dynpro. Take care no SAP logic is executed after your modification that changes your settings...
Hope this helps (please reward me if it does),
Joerg

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