Although the payment has all the fees paid, it must be verified that the customer appears as a member of the credit.
To do this we edit the credit of the customer and access the tab 'Members of the credit:
In this case we check that there are no members, but if we check the box 'Show unsubscribed members' appears our client.
We can edit the low member and change the date of retirement to a future date or leave it blank (as appropriate). This way the customer will have access again.