Adjust existing documents with a new organizational structure

Hello,

here is the problem:

We created a new organizational structure with different org.unit IDs compared to the old organizational structure. Now we have a problem with existing documents, that were created under the old organizational structure. We cannot create a follow-up document to an existing document because the org.unit in a folow-up document is automatically the same as in the main document. And this org.unit is obsolete now under the new organizational structure.

Example:

- Main document was created on 1.12.2014 under the org.unit ID 50000178

- New organizational structure was introduced on 1.1.2015

- When creating a follow-up document on the main document, the org.unit ID is automatically 50000178, which got deactivated on 31.12.2014. SAP returns an error, that this unit does not exist

Tell me please, how can we solve this ? How can we adjust the existing documents with a new organizational structure ?

Thanks!