"Transaction group" is empty, and so sales orders, inquiries,
quotations, contracts,... will be selected unless the user specifies "0"
in this field for sales order selection.
In the case of searchhelp "VNVAA" there is an easy workaround, since the
user parameter id VTV is specifed for the parameter TRVOG (column
"Default value" in the searchhelp definition). Using the notation "$VTV"
as parameter name you can address this user parameter: