Production orders during cut over

Hello All,

We have SCM 3.1 at our client . New SCM 7.1 has been installed (it is not upgarde but new scm 7.1 with GATP, SNP,PP/DS etc has been implemented ).

ECC 6.0  already exists and is connected with SCM 3.1 Now for cut over, the old SCM 3.1 will be disconnected and  existing ECC 6.0 will be connected with new SCM 7.1 system. Now during cut over how should we handle the sales orders which has open production orders in exiting SCM 3.1 system .

what are the various options to consider ?

regards

Pamela