CNPL<>NOP immediately after registration if administrator update PO#

[mazay1907]

Step to reproduce:

1. Check in like administrator
2. Go to Purchase order
3. Click to "Add new purchase order"
4. Enter valid data
5. Click "Create"
6. Click "Update"
7. Chang NOP to other number
8. Click "Update"

[mazay1907]

Not fixed