Can we update pay group on installment for the partially paid AP invoice ?

Invoice is created with 2 different company codes at distributions. The invoice has 2 installments (split by company code).

We want to: 1. Pay one installment partially - able to achieve

2. Hold the second installment - able to achieve

3. After first installment is paid, release the hold - able to achieve

4. Update the pay group on the second installment - is this possible? its greyed out.