Fixed assets merger between company code

Hi Experts,

We have two company code (ABC & XYZ) productive in SAP. The requirement is to merge company code XYZ into ABC as on 1 Feb'14.

Jan'14 month end closing will be carried out saperately for both the company code.

We have changed asset take over date of company code ABC to 01 feb'14.

Configuration of of company code ABC in OAYC "Period in which last depreciation was posted" is set up as year1999-period10, since it is active in SAP from 1999.

Is it necessary to change OAYC date to 31 Jan'14 of company code ABC ??