Describe the bug

The following error message:

"payment creation failed!
[400 - undefined] Server error 8.2 is not a multiple of 0.01
"
appears when deleting the amount of "8.2" for a patron having fees equal or greater than "8.2" CHF

The transaction is successful if the amount of the fee is in the format "8.20" [two decimals]

To Reproduce

1. Go to the admin interface
2. Locate a patron having open fees
3. Try to delete a fee for this patron
4. Enter an amount with one decimal
5. you see the error above

• server: [bib.test.rero.ch][1] or [bib.rero.ch][2]
• version: v1.7.0