Hi Rob,
Which Object structure are you using?
I would recommend duplicating the MXAPIWODETAIL object structure and deleting all the objects except the Workorder and matusetrans. You should be able to load fine with the below columns of information.
SITEID
WONUM
MATUSETRANS.ITEMNUM
MATUSETRANS.QUANTITY
MATUSETRANS.TASKID
MATUSETRANS.STORELOC
MATUSETRANS.BINNUM
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Nidhil Chathoth
ECCS Ltd