What is a suitable source for rounding amount account rules (receivables)?

Hi,

We are unable to find a suitable source for the rounding amount within the Receivables module when creating an account rule. The only available source related to rounding appears to be an indicator, which would not allow us to define a threshold amount.

Our objective is to configure an account rule condition that uses a specific rounding amount as a threshold, enabling us to direct such amounts to a defined constant.

Could you kindly help us with this issue and let us know what source can be used to set this up?

Thank you