Document search using the invoice number in document manager from a user role

Summary:

The scenario is we have assigned the document manager menu to one user role.

In this user wants to search the documents using the invoice number instead of the document id. The reason for this is we have documents on declaration ( getting generated in GTM) and on trade transactions (receiving from source system).

With the invoice number search user will be able to find both trade transaction and declaration documents at a single search.

The document_id we receive from source system is in the format of INVOICENumber_LPNumber.

For this we are thinking of the below approach:

We are currently generating the document_gid of declaration documents using the bn rule :