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I am seeing this issue seventeen+ years later and I think this is still the case, at least using AutoCAD Map 3D 2020 and a PostgreSQL/PostGIS database connection. If the Map 3D connection active, then users on other software (e.g., QGIS) cannot edit the PG database. The problem is that the entire PG database is locked out, not just the schema that Map 3D has open. Kind of kills the multi-editor capability that makes PG so powerful on other software. And yes, there is a management problem when users can simultaneously edit the same features, but separating out permissions at the table level addresses this.
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