Duplicate MRP requirements

I recently encountered a strange issue in an AX2009 environment. The MRP was duplicating the requirements creating two lines for each requirement. Debugging this issue, I found there are two paths through the code. One if there is no query filter on the MRP and one if there is a query.

I added an asterisk to the itemid in the query to resolve the issue, forcing the code to use a different path. This change removed the duplication of the requirements.