Accumulated depreciation does not mach during ABAVN

Question

Dear Gurus,
I have an issue while asset scrapping through t. code ABAVN, the accumulated depreciation does not match.  what might be the reason??
for example:
Initial Data:
APC: 1000
Acc Dep: 250
WDV: 750
After scrapping through ABAVN, document generated as follows:
APC Credit 1000
Acc Dep Debit  275
Loss on scrapping : 925
Here why the accumulated depreciation differes in ABAVN??
Secondly, when I tried to reverse the above entry (AB08) passed through ABAVN , the system does not allow me to do so.  (throwing the dump)
Please help how to overcome this problem.
Regards,
babjee

Answer 1

Hi
  Please check out the following funcionality
Proportional Value Adjustments
Based on the value date and period control, the system automatically determines the reference period for the retirement. The system automatically determines any depreciation (value adjustments) that is applicable to the part of the asset being retired, up to the reference period (retirement). The system automatically retires this depreciation at the time of the retirement transaction. This procedure guarantees that the percentage of the book value that is retired is identical with the percentage of the acquisition and production costs that is retired.
Graphic: Determining Proportional Value Adjustments
The system automatically posts the proportional value adjustments retired during an asset retirement. You can specify special transaction types for this automatic posting. You enter these transaction types in the Customizing definition of the retirement or transfer transaction types (Value adjustments function). These special transaction types for the proportional value adjustments are particularly important for group consolidations, so that the individual transaction can be identified as retirement of transfer.
The standard transaction types delivered by SAP are already defined in this way. The system uses the transaction type 290 for proportional values with retirements. For transfers it uses transaction types 390/395 (transfer retirement/acquisition).
Regards
Jose