Cnanot link Transaction and Invoice.

Why I can't validate my invoice to this transaction ?
There are 2 transactions related to this invoice, it is normal that the total has a difference. How could I validate my link between this transaction and my invoice ?

https://ibb.co/BL1ZFvW

Regards

Okay, I resolved the issue directly, I didn't see I was able to modify the amount of into the blank input. I'm now able to submit my link.