Then you need:
1. Create an additional field with a drop-down list type and link it to the directory like this
https://tppr.me/cvrAVIn the field "Field of the directory" you need to select the column "Identifier ID"
2. Do the same for the current field (order.customorder_Oblkoviizapis), but in the field "Directory field" you need to select the column "Account name"
3. Next, in the business process, put the action
https://tppr.me/jMlgW instead of test 1, you need to select the additional field created in point #1
4. after completing point 3, set the action
https://tppr.me/BZ0JyAfter these actions, you can test