How can update Payment Method for cash advance?

Summary:

Need to update Payment Method for cash advance

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My customer manages the advances to employees through another system, then this system sends us the information through an integration with the payment method with which it will be settled, which may be different from the one associated with the employee. How can I change this value either in the expenses module or in the accounts payable module, since we can manually make this adjustment in accounts payable, however it is required to do this in practically all of them and we are talking about about 10,000 advances per month in this case, which makes it unmanageable for the operational