I found this KB article. Any risk in following the steps to allow part specific UOM? I remember that UOM changes in the past were very finicky… (but hoping that a part specific UOM would allow an alternate to be chosen - FT or ROLL).
UOM Part Specific Box Dimmed Unavailable KB0032735
Issue
Part setup has a conversion factor, and the UOM is wrong. Customer needs to change the conversion factor when the option is not available.
Resolution
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Click on Inventory Management
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Click on Setup
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Double Click on Part Maintenance to open it
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Go to Tools and select Personalization and click Yes to the Clear this form ?
Note: A separate Control Properties box will open -
Click back to the Part Maintenance screen
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Select the UOMs tab
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Click on the List tab
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Click anywhere in the Part UOMs area/field
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Go over to the Control Properties pop up screen and select the (Collection) drop down menu
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De-Select to unhide the override check box
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Click on the header of the Control Properties main window and then click on OK
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Go back to the Part Maintenance screen and bring up the part that you want to change
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Navigate to the UOMs tab and then the List tab
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Highlight the part specific row you want to modify
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Flag override button
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Save and then refresh the screen
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Modify the part specific factor
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Save
Your factor should be changed.