The version you mentioned, "12.1 SP4 52", likely refers to:
Improved fabrication checking and modeling extensions help ensure that what is designed in 3D can be accurately built on-site, reducing costly rework. Improved Search & Data Management: aveva pdms 121 sp4 52
The Draft module in SP4.52 saw a significant update. Generating General Arrangement (GA) drawings from 3D views became more intelligent. The "Auto-Dimensioning" feature, specifically for piping isometrics, was refined to produce ANSI/ISO-compliant drawings with fewer manual overrides. The version you mentioned, "12
PDMS 12.1 uses user-defined rules (UDA - User Definable Attributes) to enforce design standards. For example, a pipe must always connect to a valve with a gasket. SP4.52 improved the rule-checking engine, reducing manual clashes. SP4.52 improved the rule-checking engine
This service pack introduced several significant improvements aimed at streamlining the design-to-construction pipeline: Advanced Piping Design: