Error when converting Flat File


I created a template for my flat file and loaded it using the putTemplate service. I am able to make calls to this template and use this as the EDITemplate input to my convertToString service which I am using to convert my flatfile record (the record was created manually). I am getting the following error when I reach this service in the flow:

Segment ‘BIN’ is not defined in the template object [EDICOR.000020.000062]

BIN is the name I gave to the record I created reflect my flat file and to map data from my XML document. Any suggestions will be greatly appreciated.