Refactor undo function

Refactoring undo function is necessary. The current state does not allow a use of its full capabilities. Explanation:

- let's say that we have the following hierarchy:

Europe

=> West

==> France

==> Germany

=> East

==> Slovakia

==> Hungary

and 2 Measures, Units / Cost

User1 locks the area West / Units

User2 tries to lock the area East / Units. It fails and says : "Unable to set reference for undo because some of the selected cells are already locked"

First the error message is wrong since East is not locked because of the User1 action

Second according to the support the common parent of East and West causes that locking East is not possible. But it does not make lots of sense since they are 2 different elements and the parent is not involved in the locking

Development from jedox justified that with : "When a lock is defined it locks also all non-string ancestors and all descendants of elements from the locked area."

We see of no reason why.

Now let's try the following:

User 1 locks the area West / Units

User 2 locks the area East / Costs : this works just because of the different element in the dimension Measure. But if we refer to the reason that East and West have a parent in common then it should not work there either. Why arbitrarily from 2 dimensions ?

So a refactoring of the function should be necessary to lock areas in the same hierarchy

(Support Ticket #2020021378000646)