Dual Unit of Measure Problem on Receiving

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Hi experts,

Customer request to enter two type unit measures (kilogram and bale) while goods receiving. The problem here is customer enter one unit measure as kilogram in creating purchase order step. There is no measure conversion between kilogram and bale in creating purchase order step. After a certain period, bale quantity is clear and they request to enter bale and kilogram quantities on goods receiving part. Kilogram information is gotten automatically from purchase order but bale quantity have to be entered manually. There is no standard measure conversion between kilogram and bale.

Is there a way enter bale quantity manually on goods receiving ?