New GL Document Splitting Activation Migration Project

Hi

Customer runs on SAP ECC 6.0 with new GL active since Jan 2010. Now to generate Profit Center level FS, wanted to activate Document Splitting.

The customer is decided to go for sap gl migration cockpit which could support to migrate open items for the FY 2012.

As suggested by SAP the migration date should be start of the new fiscal year say 01.01.2014.

Assuming the activities like test migration, validation session (Done in Production Copy), corrections to Production consumes max 8 weeks (As conveyed by SAP) & the production migration a weekend, what could happen to the data being posted during this period (Say Jan 01 2014 to Feb 28 2014).

Would those data also fall under migration plan of production weekend, am looking for expert opinion to address to the customer.

Saravanan