Purchase Requisition in Ax 2012


I started with the implementation of purchase requisition . Its new for me.

Created a workflow . On submit of PR ,I got the following error

Category 400 is not a valid dimension value in combination with the following dimensions values that are valid:

MainAccount 471100.

The combination was not validated beyond the Category financial dimension.

Dimension values were validated with this account structure: Account structure - CAE

Please let me know with a solution for the above issues