Problem
The GL account mapping between ServiceTitan and QBO is causing an issue. A GL account for checking is set as an asset type and bank subtype in ServiceTitan. However, in QuickBooks Online, the account is set as Banks type with checking subtype. When trying to change the GL account in QuickBooks Online, the bank(s) option is not available under the Save account under field.
Solution
Types with Subtypes do not exist in QuickBooks Online. Instead, you can have Types and Detail Type. In QuickBooks Online, you need to make sure that transactions go into the correct account.
You can create an asset account and name it "Bank" so you are able to select that account when selecting Bank. The transactions are still set as assets.
To create a new account in QuickBooks Online:
Switch to Business View.
Go to Charts of Accounts and click New.
Select Asset as the Account Type and name it "Bank".
Save the new account.
When selecting Bank for transactions, choose the newly created Bank account.
The transactions will still be recorded as Asset.