I found errors by hovering over the Error Information in the thin client, but also in the DataStage job logs, which does a better job of indicating which messages are info, warning, or fatal. The first one or more fatal error message generally look like this:
How can I resolve this type of error and get a quality score generated?pxbridge(6),0: [Input link 0] Schema is non-negotiable. Attempted to modify field: field_name, attribute: IS_SIGNED. Design-time value: 0. External value: 1 (CC_DBSchemaRules::markModifiedAttribute, file CC_DBSchemaRules.cpp, line 1,314)