The customer can use the GDGLONG option to have more than 98 generations of a disk dataset, but the parameter GDGLONG can only be used when no active version already exist. As there are active versions for now, he will have to save the current versions and redefine the dataset.
As it is not possible to change the GDGLONG parameter when there are active versions, the following process need to be used:
Now your dataset is correctly defined and you don't need to change any JCL.
Release: DYNAM.001AO-7.1-Dynam/D-Disk Management