The Proceedings on Discharge that enclose some South Africa units' attestation papers contains a section on the front page with instructions to the Paymaster. These often contain settlement sums of money, eg
I had always imagined this was the settlement of outstanding pay. From you post, I started thinking whether this could have been use to pay the War Gratuity for non-fatal casualties but I think not because there are some men (mostly not casualties) with no settlement values.
Given the difficulty of sending medals and clasps to ex-South African servicemen in the years after the war, I wonder just how many received a War Gratuity?