Form personalization to Select All reconciled lines

Hi gurus

This is our business case. Users reconcile (both manual or automatically) bank statement lines using Cash Management

But sometimes, those transactions must be unreconciled due to user errors. In case there are multiple lines to be unreconciled, we need an option to select all lines via personalization

I've created a SPECIAL31: Select All Reconciles Lines button (WHEN-NEW-FORM-INSTANCE)

Then the SPECIAL31 trigger event wil have the following properties:

Item

RECONCILED.MULTI_SELECT

VALUE

Y

However I'll need all lines to be unreconciled, how to?

Thanks

Regards