SLA Account Derivation Rule for Discount Account in Payables Invoice

Hello,

I have the following requirement and i believe it could be achieved using SLA Account Derivation Rules. Could somebody please guide how exactly this could be configured.

"The 'Discount Taken' charge account should be derived by replicating the same charge account values as those applicable to the original AP invoice, against which, the discount is being taken (with the exception of natural account). The logic to derive the natural account segment should be as follows:

- If the original expense natural account is prefixed with a 'B' then the 'discount taken' natural account should be: B0052157

- If the original expense natural account is prefixed with a 'C' then the 'discount taken' natural account should be: C1801220