Error 'You cannot allocate more that the outstanding amount' when procesing suggested payments

This message indicates that somewhere in the suggested payments list, there is a payment value the exceeds the outstanding value on the transaction.
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When you enable payments on the suggested payment list, this will not be checked until you try to green tick to process the list. At this point all of the payments in the list will be checked so please bear in mind that you will need to check all of the payments in the list to find the one that is causing the issue.
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One you have found this, please alter the payment amount as needed. At this point you should be able to process the suggested payments list.