Problems with Batch Number in WM Physical Inventory

I am trying to troubleshoot a client that has the following scenario:

1. Material in storage bin doesn't have batch number

2. Batch management has been activated.

3. A physical inventory document was created for the location where the material is.

4. The physical inventory has been counted.

5 When trying to write off differences in LI20 it is giving an error to enter a batch number.

I understand clearly that the system is interpreting that the batch number is required and missing in master data. I am not able to modify batch number for the quant in LS22.

The implications behind deactivating batch number right now would be too complicated and not the right procedure either.

What is the correct procedure in this case?

Thanks!