Did you check the 'Parameter assignment' between appended search-helps and the collective search-help.
Look at collective search-help definition, there is a search-help exit 'ESH_F4_HELP_EXIT', look at its code, you should check compliance of your appended search-helps with currently active implementations of Enhancement Spot BADI_ESH_IF_F4 in your system.
Hi!
First of all please check the following link: https://blogs.sap.com/2013/10/10/enhancement-of-standard-search-helps-in-sap/
And if you've done all as mentioned there, please, check if the parameters are set as importing in your search help as in the standard one, since they can not be mapped outside
Evgeny
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