I input 743 amortization expense tin the Depreciation area.

It will appear as UPE on Schedule E.  UPE treatment is odd because UPE are allowed only when partnership agreements allow them.

It does not affect QBI, which was my conclusion after doing research.

Review the K-1 rec worksheet. It is listed with Unreimbursed expenses (nonpassive). This sounds odd but I think it is correct.