Understanding FICA -Funds Management posting for Credits posted due to invoice reversal

[Former Member]

I have a question pertaining to Fund value populated when a paid invoice is reversed.

We usually have 3 installations -Water/Sewer/Storm.

When a paid invoice is reversed after reset clearing the credit is posted on contract account with Main 0060 & sub 0010 (Payment on account). When i look at derivation rules for the main sub for 0060 & 0010 in our system ,it points to a Fund for Utility collection clearing. But on the actual reversal document with credit in the funds management tab I see one of the followings fund populated:

• Water Operations
• Sewer Operation
• Storm Fund

I activated trace for derivation rules & it seems the value is not coming from derivation rules. Can anyone help me understand, where the value is populated from & logic behind posting to a particular fund . I have attached the images of posting for reference