Changing BDC / Assigning new BDC

Hi,

We are planning to change Item Master data BDC assignment and change BDC. This we are doing to take out Assets/Equity overview reports from BCS.

1-Changing Existing BDC to include Movement Type of Type 02 (Reqd,if blank default)

2-Assigning BDC with Movement Type of type 02 (Reqd, if blank default) to items

3-Assigning BDC with Movement Type of type 03 (Reqd, default allowed) to items

Post, above activity do we need to run Break down Check and carryout correction of historical transactions? Is it a must?

Why is this required, if I am going to use enhanced data prospectively?

Please advise

Best Regards,

UR