You have the possibility to prepare a new Cap Strategic Plan version (for instance 1.1) while the previous one (1.0) is submitted to EC.
However, you can't send this new version to the EC until the previous one is 'Returned for modification by EC' or 'Adopted'.
If the previous one 1.0 is 'Returned for modification by EC', then you can send this prepared version 1.1.
If the previous one 1.0 is 'Adopted', then you have to:
1) Cancel version 1.1
2) Create new version 2.0 based on either 1.1 or on 1.0 (by opening the desired version and by clicking on 'Create new version').