If for example, an asset has an existing additional cost was dated 31/12/24 and further work recognises that another transaction for August 30 needs to be added to the asset, you will be unable to add the prior dated addition. Please see the error message below.
The system correctly prevents adjustments to dates before an additional or adjustment action. Dealing with prior period adjustments can become messy (journals, recalculating depreciation, and restating the book value).
You could reverse all transactions and re-enter them chronologically or adjust the book value in the current period (do a true up in the current period).