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If you experience unexpected behaviour of the ValueHelpField component, this is a guide to fix it.
An example is that only the first column of the result list is displayed.
Here are the necessary changes:
Pre-check: NEPTUNE package should be set as modifiable in SAP transaction SE06.
1 - Import the attached (ZIP file) App /NEPTUNE/F4_SEARCH_HELP by using NAD. (transaction /NEPTUNE/DESIGNER).
2 - changes in Class /NEPTUNE/CL_NAD_SERVER (transaction SE24) in 3 methods:
2.1 - Method UI5_VALUEHELP_AJAX_INIT - 1 line changed.