Custom Print - How to select which Detail form Tab when using the Word 2003 XML method?

Hi,

We are using the WORD 2003 Custom Print XML method for all of our Custom Prints.  I have to select Detail form items from a BP that has multiple lower form tabs.  How do I tell the Custom Print which Tab I want data for?  For instance if I have "amount" on both tabs, how do I tell the Custom Print to use the amount from one of the tabs and not the other?  An example of the XML to use would be extremely useful.

Thanks!