I think you may be adding rather than changing. Make sure you're uploading C to your FC field and not A.
Here's what I have on the upload. We're on V10 and this is the info it's showing for each field. I'm a novice at add-ins so not sure what I need to change. If anyone has a file they're already using for V10 I'd love to compare to see where I'm going wrong.
f3,ICL-COMPANY
f5,ICL-LOCATION
f6,ICL-NAME
f10,ICL-LOC-TYPE
f14,RQL-FROM-COMPANY
f16,ICL-REPL-FROM-LOC
f24:0,LINE-FC1
f25:0,BGD-BIN-SEQ1
f26:0,ITL-PEFER-BIN1
f27:0,ITL-ITEM1
f28:0,ITL-REORDER-POINT1