invoice posted to wrong receipt...

SOLVED

I tried to enter an invoice in the purchasing module and could not find a receipt to attach.  Then I did a lookup for the receipt using the reference number and found that the receipt was posted to another invoice.  How can I find the information to tell me what invoice was posted to that receipt? 

Once I find that information, how will I detach that receipt from the incorrect invoice so that I can use it to post the correct invoice?

Any advise would be much appreciated. 

Thank you, 

Nancy