Adding Parameters to pass to a drill through Report

I created a 'Matrix' format report, which shows GL Account Number, GL Account Description, Source Document, the Total GL amount. 

I created a 2nd report which is a drilled-down Transactional level report based on my Matrix report in Total GL amount.

For example:  GL Account Number:  000-12345-000-100 has Total GL amount $3000, the source document is from SJ (which was from Sales Invoice).  I want to show the 2nd report (called it as SourceDoc report) with Sales Invoice information when user click on Total GL amount of $ 3000.  This $ 3000 dollars on the 1st matrix report is based on the GL_Trx_Date

Here are the parameters that setup in the "Text Box Propertities"-->Action-->Select Go to Report

Name:                         Value:
Start_TRXDATE          Start_TRX DATE

End_TRXDATE            End_TRXDATE

GL_Account_NO          GL_Account_NO

Source_DOC              Source_DOC

However, the 2nd report only show one single Sales Invoice.  The $ 3000 was from 3 different Sales Invoices. 

Could someone tell me what did I do wrong?   The parameters can pass to a Drillthrough report. However, it comes up one single sales invoice.

Please advise

Thanks,

Josephine