Possible to get application parameter in value help

Hello colleagues,
we developed a value help for business partner to use it in an wda-component . in this value help only those business partner should get supplied where the user has a relationship to . to make it really difficult we can not use the backend user (crm) but the portal user . in the component which uses the value help we achieve to get the user via application parameter from the containing iview but as soon as the user calls the value help this context is lost and we can no longer use the application parameter (which is in fact "out" of the iview) to retrieve the user of the application and therefore get a dump.
Is there a possibility who to get application parameter of a component in a value help called by this component ?
Thanks in advance

PLease refer to this link
You can enter parameter values for certain screen fields for displaying a SAP transaction here.
This field is optional.
The parameter values are specified with the following syntax:

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