Lost Update in material history

[FabianMauz]

If 2 users edit the same material, a lost update is possible:

User 1 : Load the material M with property E1
User 2 : Load the material M with property E1
User 1 : change the property E1 -> E2
User 1 : Save the material M -> saved history : oldValue : E1, newValue: E2
User 2 : Change property E1 -> E3
User 2 : Save the material M -> saved history : oldValue : E1, newValue: E3

E1 is wrong in this case and should be E2.

[FabianMauz]

A possible solution would be to check before saving the history delta whether the "old value" has changed in the meantime and adjust the delta if necessary.
This (updating and saving) would have to be done within one transaction, i.e. in the same TransactionScope.