Odoo v14 Asset Depreciation

Migrating an asset from a non odoo business application with existing depreciations.

The asset Acquisition Date  is  03/jun/2021

with a Prorata Date of  03/jun/2021

and

Start Depreciating 30/jun/2021.

So far so good. Computing the Depreciation gives correct value per month.

30/06/21 174.38 €

31/07/21 186.83 €

Let’s say Client goes live with Odoo on 1st August thus we want to  eliminate the first two months of depreciations that is

30/06/21 174.38 €

31/07/21 186.83 €

I have tried all combinations of ' Existing Depreciation Schedule' but have been unsuccessful to eliminate the first two months and once I confirm they are always posted.

any feedback is appreciated

 (unfortunately  I cannot  attach  screenshots,  but  I  can  email  to  anyone  who  can  help)