Hello all, thank you for your updates and hints. Lets bring the discussion to an end ... The "problem" started when we began to install z/OS 1.12 and my colleagues did not want me to use dynamic steplib in the future (that was another post some month ago). So we decided to bring this load library to LNKLST. This worked fine for some weeks. No we wanted to install some maintenance to this library and this did not work as expected. The library is PDSE and from the posts I learned that we should not do what I wanted to do. So finally we decided to remove it from LNKLST and define it as a STEPLIB to the logon-procedure. That solves all the problems with lnklst and makes it much more easier to install maintenance. Bringing a dataset to LNKLST has nothing to do with "chic" or something else. Its just a way to make lmods available for users in an easy way. All the following problems when its PDSE and in LNKLST and you want to add/change lmods where not expected and I was a little bit surprised. By the way ... I'm not a z/OS-sysprog - only responsible for non-z/OS-software. So I was not aware of all the restrictions z/OS has. But I know that (I think) a lot of sysprogs do what they should not do. Yes I understand Peter and Jim and some others who say what I should not do, whats on my own risk and whats not supported and and and .... I know some of these problems more than 30 years and since that time there is no useable supported solution from IBM. But that's another discussion. Finally ... this PDSE-library was moved to logon-procedure and removed from LNKLST and all works fine and we have to live with all the secondary effects. regards Juergen
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