Voluntary payment acknowledgement: officers must issue DRC-04 when taxpayer reports payment in DRC-03; partial payments require Part B. When a taxpayer notifies payment in Form GST DRC-03, the Proper Officer must issue an acknowledgement in Form GST DRC-04; if only a partial payment of the amount shown in Form GST DRC-01A is made, the person chargeable must submit the prescribed information in Part B of Form GST DRC-01A.