In the documentation, a ModuleID declaration in the upstream sources is typically used to define a downstream-specific anchor ID to correspond to an existing upstream ID. Due to these distinct IDs, cross-reference links that are used in both the upstream and downstream documentation often target different anchors.
When a link uses the simple xref:<anchor_id>[link_text] format, the script that fetches upstream files for use downstream is unable to convert the ID, resulting in an error of the type The following Unknown ID xxx used as an internal cross reference.

To enable the fetch script to convert IDs in a link, the link must use the following format:
{link-prefix}:{link-<link-attribute-shared-upstream-and-downstream>}#<anchorID>[<Link_text>].

Links that include the following IDs on the specified file:line require reformatting:

postgresql-permissions postgresql.adoc:117 DONE
postgresql-security postgresql.adoc:1959 (1981 on master) DONE

mongodb-snapshot-metrics mongodb.adoc:1409 DONE
mongodb-streaming-metrics mongodb.adoc:1410 DONE

offline-schema-updates sqlserver.adoc:2298: (2311 on master) DONE
online-schema-updates sqlserver.adoc:2299 (2312 on master) DONE
sqlserver-snapshot-metrics sqlserver.adoc:2461 (2474) DONE
sqlserver-streaming-metrics sqlserver.adoc:2462 (2475) DONE
sqlserver-schema-history-metrics sqlserver.adoc:2463 (2476) DONE

example-basic-content-based-routing-configuration content-based-routing.adoc:178 DONE

topic-creation-groups topic-auto-create-config.adoc:86 DONE
topic-creation-group-configuration-properties topic-auto-create-config.adoc:87 DONE

options-for-applying-the-transformation-selectively outbox-event-router.adoc:24 DONE