Is this a source file or a physical file? If it’s a physical do a DSPFD and check the maximum members value. If this is a source file, how are you trying to add it?does it already exist? check the file authority and see if you are authorized to make additions. just a few suggestions.
Actually no file opening in edit mode whether its a pf or clle neither any new file is creating, it is showing the error: error found on STRSEU command
Does the file even exist? If it doesn’t, you have to create it before it can be edited. Use the CRTSRCPF command to create a source physical file. And be aware that we need message identifiers in order to know what error is happening. — Tom