After hitting the Preview button on an SQL VARA, you get the following error message (red banner):
Runtime error in object 'XVARSIM(GET)', line '00014'. DS return code: '0001001003': 'U01001003 Invalid STREAM Memory, STREAMIN is not possible.'. Error occurred in UCDSFUN at position: '<unknown>'.
1/ The first part is related to the Preview failing:
Runtime error in object 'XVARSIM(GET)', line '00014'.
2/ The second part is a generic error that can have many different causes:
U01001003 Invalid STREAM Memory, STREAMIN is not possible.
It is related to a temporary table of structured data that is requested.
A likely cause is that the requested data is empty or invalid.
Check your Workflow and objects, notably the UC4 script in Pre- or Postprocesses for possible syntax error.