How to set a maximun of 10 items (new elements) in SAP OSA?

In SAP Objective Settings and Appraisals, there is a "free enhancement" named "Add new element", I want to copy it, creating a new enhancement with an extra validation: count the number of new elements the user have created and stop with a warning message when the number of elements reach 10.

The question is: how can I count the number of VC objects (criteria level) that have been created in preparation or plan status?

We have SAP ECC 6.04 (enh. pack. 4) and SAP Enterprise Portals 7.0.

Thanks in advance!