From the Datacom/AD manual in the Install section:
The libraries that are listed for searching must include the following information in the order shown:
1. User-customized libraries that you might have defined for specially assembled and linked tables. For example,
DBMSTLST, DBSIDPR, DDSRTLM, or User Requirements Tables (CUSLIB)
2. CA Datacom®/AD base executable library (CAAXLOAD): CA Datacom®/DB, CA Datacom® Datadictionary™, CA
Dataquery™ for CA Datacom®, CA IPC, CA Datacom® Server, and CA Datacom® SQL