[16.0] Error add new statement line

[ljimenezsidoo]

When try to add new line in account.bank.statement after import the bank statement error is displayed

Module

account

Describe the bug

ValueError: Compute method failed to assign account.bank.statement.line(, ).running_balance

Compute method should use recodset not newId

To Reproduce

Affected versions: 16.0

Steps to reproduce the behavior:

1. Go to runboat of this repo bank-statement-import
2. Open one account.bank.statement with lines and try to add new one.

Expected behavior
You should create new line without problems