Joined: 23 Nov 2006 Posts: 19270 Location: Inside the Matrix
A Address Space allocated a dataset that I must use.
Which address space?
If you try to edit the dataset, it will say "in use". Then press F1 two times and you can see what is holding the dataset. If this is some production process or some other user, you will probably need to wait (or make arrangements to have the dataset made available).
The ddname is not what holds the dataset - the dataset name does.