I am attempting to "Make inactive" a checking account that has been closed, but keep receiving the message: "You can't delete this account as it is used as default for one of the sales lines."

The instructions to "change the account they're linked to" ("they" = Products and services?) and "make products and services that use the account inactive" seem to assume you know which product and/or service is using this checking account "as default." Do I have to click into all 202 to find the one? And what if that's not even the right place to look for whatever is preventing deactivating the checking account? Where else should I be looking?

Thanks for any insight you might have!