"We don't have one in your size so here's a deficiency chit".
I was told of the occasion when the drinking water container in the ejection seat survival bag of an operational bomber type was changed to "gulp size" sachets. Having thrown away the old drinking containers, a signal arrived stating that the sachets were not to be used because of some bursting under low pressure conditions. The solution at one station was for the safety equipment section to put a deficiency chit into the survival pack instead of water. This went on for a few months until someone discovered the discrepancy and apparently, heads rolled. Milo enterprises anyone?