Invoice in 'Validated' status - one item is returned to supplier but invoice does not automatically

Hi everyone, we're encountering an issue with the Invoice Validation process as follows:

Monday

Invoice #123

Qty Ordered - 2

Qty Received - 2

Qty Billed - 2

- No holds applied after Invoice Validation is run

Wednesday

Qty Ordered - 2

Qty Received - 1

Qty Billed - 2

Issue: We currently have Invoice Validation scheduled to run every evening. The problem that we're having is that although one item has been returned to supplier on Wednesday, the invoice still remains in a 'Validated' state despite the fact that Qty Received does not equal to Qty Billed anymore and as such, should go on Qty Rec hold. Please note that we currently do have the Qty Rec hold enabled in the system.