Dear Adriano,
You could set the flag for T090NP-XBZDAT.
a) Meaning of T090NP-XBZDAT: SAP notes 92925, 53166 and 165036:
..."
1. If you want the depreciation for each acquisition to be calculated
according to the asset value date of the acquisition, you have to
assign these acquisitions to different fixed asset sub-numbers.
..."
"...
1. This indicator frequently caused misunderstandings. Therefore, it
was removed from the calculation key maintenance as of 3.0E.
The indicator only took effect when there were several acquisitions for
each acquisition year. If this indicator was set, the depreciation in
the acquisition year for these acquisitions was not uniformly determined
from the depreciation start date but was instead determined from the
asset value date of the various acquisitions. However, if values were
not calculated uniformly for these acquisitions in the acquisition year,
it follows that these values should also be calculated separately in the
future. However, this function cannot be used with this indicator, but
only by separate sub-numbers for the various acquisitions.
"..."
..."
b) Where you find this sign T090NP-XBZDAT?
You cannot set this sign T090NP-XBZDAT per customizing. Is has to be set
in the table per debugging or per ABAP.
c) Notes 92925, 53166 and 165036: this sign is not supported by SAP
d) Another possibility: post to a sub-number
I hope I could help you.
best regards Bernhard