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As far as I know it is possible to set up Maximo rules so that in various WO statuses it is possible to edit assetnum field in WO.
The question is what happens with the already saved records (assets cost, etc. coming form that WO) if we change the asset or if we insert it for the first time?
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If you want to engage IBM Support, you should open a support case:
https://www.ibm.com/mysupport/s/createrecord/NewCase