DSXchange

Sorry - I can't see all your reply. Even so, I figured editing is OK as it's provided as an option. Besides I edited it within about a minute of the original post, so that's just luck of the draw I guess. You could always delete your posts if you'd like. I resolved it by looking at what you had sugg...

I've found the problem - thanks for that :D

I checked the schema, it shows:

record
( dummy: string[1];
)

I have copied this data set from another job though, into a new job, so I can change it to a sequential file, so nothing should have changed at all.

I checked it through Data Set Management also, which shows the segment files in:

/gcdm/prd/DataSets_N1/....
/gcdm/prd/DataSets_N2/....
/gcdm/prd/DataSets_N3/....
/gcdm/prd/DataSets_N4/....

When I try to 'View Data' on an input data set, I get the following error: Error executing View Data command: ##E TOPK 000000 10:18:54(004) <_PEEK_IDENT_> Input dataset does not have field: "ARR_CLUS_ID". I have checked that the data set exists and it does contain this and other columns.