If One or more of the selected Categories and/or their child Categories are modified (edit/delete) and are yet to be approved, then no changes can be made to the existing category. In such cases, we will have to wait till the change is approved to proceed with another change. For example, consider the tree
As a user, if you make some modifications to a category Category Area or its child L1,L2 or L3 and submit the changes for approval. Another user will not be able to make any changes such as perform any edit or delete in Category Area or L1, L2, L3 until and unless all the changes made by the previous user have been approved.