Hi,
Such way of working with linked tables is quite unusual, but what I've recommend:
Create another link between tables, in 1st table call linked field 'Paid Sales'. It will auto-create another linked field in table 2 and mirror there all new links that you creating in table 1.
When you paste "Unpaid Delivered Tasks" in "Paid Sales", it will link it to each corresponding code in Table 2, understanding that #C0005, #F0055 are two different records.
- Make "Advisor Payment Computed Status" formula field in table 2, so if {Auto-created linked field} is empty, it's Unpaid, and if not, it's Paid
- Create automation with 'when record matches condition'. If '"Advisor Payment Status" != "Advisor Payment Computed Status", add action 'Update record' and update your field.
Later, you can even omit 'Computed Status" and automation run, if it's OK to turn "Advisor Payment Status" to the formula field type.
Note - Codes in table 2 must be truly Unique. You should paste #C0005, #F0055 without brackets, otherwise it thinks it's a single value. If you paste non-existing code, it will create a new record with such code.