Columns?  Do you mean variables?  Do the variables with a NAME value of ref_desc, ref_code and src_type_code exist in the dataset referenced as B?  Run PROC CONTENTS and check. View?  Is the dataset referenced a B a VIEW?  What is the definition of the view?  Perhaps the datasets that the view queries have changed so that one or more of those three variables no longer exist or have different names. Is it a view into some foreign database?  Does that database use case sensitive variable naming (examples include postgresql and Redshift).   ... View more

One way would be to add these to a code/program node as the first task in your project. ... View more

Looks like this is an error coming from an external database query. What database are you querying and what SAS/ACCESS engine are you using? ... View more