CIS labour and materials bill

I have entered up a bill from a subcontractor with both labour £700 and materials £50.  I posted the materials total to CIS supplies and materials reimbursed.  However, on my CIS return the gross payment is showing as the labour portion of the bill only £700 and the figure for materials is zero.  The tax deducted is correctly shown on the return.

Am I using the wrong account to post the materials to?