Clearing program J_3RCALD doesnt apply FIFO method

[AlexandraSk]

Hello,

We are having an issue following the FIFO method for customer payments, when a credit memo invoice is posted for a customer. The order of the documents to clear is changing , not following the FIFO method, when a credit memo exists. The credit memo is created with a reference to an invoice.

In the clearing program J_3RCALD, Partial payment is selected as clearing process, and in OB74 we have not selected any rule for account type D, leaving it blank.

How can the FIFO method still apply, even when a credit memo invoice is posted?

FBL5N:

In an example, the doc number in yellow, which is third in order to clear, according to the incoming payment, is not selected in the clearing program:

Also, Q3 is the credit memo document

J3RCALD:

Thank you,