Blanket Purchase Order Report and Purchase Order Report

Hi experts,

Can i use (i.e link) Blanket Order Form with "Purchase Order Report" and Purchase Order Form with Blanket Order Report. If this is done i can save myself from lots of customization.

Can anybody help me, actually what i had tried is, i had made some changes to the codeunit
"Document-Print" to achieve what i want but it didn't worked,

here is the code:

CASE PurchHeader."Document Type" OF
PurchHeader."Document Type"::Quote:
ReportSelection.SETRANGE(Usage,ReportSelection.Usage::"P.Quote");
PurchHeader."Document Type"::"Blanket Order":
ReportSelection.SETRANGE(Usage,ReportSelection.Usage::"P.Blanket");
PurchHeader."Document Type"::Order:
ReportSelection.SETRANGE(Usage,ReportSelection.Usage::"P.Order");
PurchHeader."Document Type"::"Return Order":
ReportSelection.SETRANGE(Usage,ReportSelection.Usage::"P.Return");
ELSE
EXIT;
END;


here i had made the following changes:
ReportSelection.SETRANGE(Usage,ReportSelection.Usage::"P.Order");
and

ReportSelection.SETRANGE(Usage,ReportSelection.Usage::"P.Blanket");

can anybody suggest me the solution.

Thanx in advance