Problem while generating an Export DataSource in our Productive BW system

Hi all

We are trying to generate an export data source in our productive system and for any infocube and we are getting the error "SAP System has status 'not modifiable', Choose 'Display Object' or 'Cancel'." please see the following steps to reproduce the error, for ODS's everything it's working just fine

In the attached document, you will see he error

Best Regards,
BW Team

Please follow the next steps in order to reproduce the error:
1. Logon into BW production system
2. Go to TX RSA1
3. Find infocube "XXXX"
4. Right bottom on your mouse, go to "Additional Functions" and then select "Generate Export Data Source"
5. You will get the following error "SAP System has status 'not modifiable', Choose 'Display Object' or 'Cancel'."

The error is only happening with infocubes, for ODS's everything it's working just fine.

We already check several notes and in RSA1 the "Transport Connection" --> "Object Changeability" and everything seems to be OK, we used to do it but "something happened" and we cannot do it anymore