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Backward compatibility (i.e. a "recovery cluster" reading a copy export set created on a higher level of machine code) is not possible because internal database formats or other fields could have changed and the older code level machine will not understand what those changes are. However, your statement is incorrect when you say that the same code level is required to create the copy export set and to read it. The actual requirement is that the cluster reading the copy export set is at the same level or higher than the creating cluster.
Creating a new RFE based on Community RFE #95255 in product IBM TS7700.