JinJin48

SAP Consultant | BTP · S/4HANA · US Global Rollout

June 26, 2026 · 13 min read

SAP QM Master Inspection Characteristic

The Master Inspection Characteristic (MIC) is the reusable quality criterion that defines exactly what is measured or evaluated in a quality inspection. It stores the characteristic type (quantitative or qualitative), measurement unit, tolerance limits, and catalog assignments that drive results recording at the shop floor. Every Inspection Plan references one or more MICs to specify its inspection scope, and shared MICs eliminate duplicate maintenance when the same criterion applies to multiple materials or processes.

Part 1: Master Inspection Characteristic — Core Concepts (All Modules)#

1.1 What Is the Master Inspection Characteristic?#

The Master Inspection Characteristic is a reusable inspection criterion that decouples the definition of “what to inspect” from the plan that specifies “how and when to inspect.” A single MIC can be assigned to many Inspection Plans across different materials, work centers, and inspection types, ensuring that the measurement standard remains consistent and centrally managed.

1.2 Quantitative and Qualitative Characteristic Types#

The most fundamental design decision for any MIC is whether it is quantitative (measured on a scale) or qualitative (pass/fail or attribute-based). This choice controls the entire results recording experience and the statistical evaluation available for that characteristic.

Design principle: Decide the characteristic type at blueprint. Changing a quantitative MIC to qualitative after results have been recorded requires archiving all historical inspection lots using that MIC — a costly remediation in production systems.

1.3 Organizational Levels and Data Hierarchy#

The Inspection Characteristic (IC) master is entirely client-level — one IC such as “IC-DIA” (Diameter) is defined once and can be reused across any plant, material, or inspection plan. It does not belong to a plant or material by itself; it becomes plant/material-specific only once it is copied into an Inspection Plan Operation.

Two of IC’s neighboring client-level masters are directly linked from the IC itself: an IC references exactly one Inspection Method (how the value is measured), and optionally a Certificate Profile (for outbound quality certificates). Sampling Procedure and Dynamic Modification Rule are also client-level masters used during inspection, but they are assigned at the inspection plan/operation level, not on the IC record itself — they sit alongside IC as siblings, not as its children.

The IC’s second half of the picture is plant-level: once copied into an operation, it becomes an Insp. Characteristic that carries its own concrete value and an optional back-reference to the originating IC.

Data hierarchy with a concrete example

Client 100
   │
   ├── IC "IC-DIA"        Diameter (quant.)
   │      │
   │      └── uses ──> Inspection Method "IM-CMM"   CMM Measurement
   │
   ├── IC "IC-SURF"       Surface (qual.)
   │      │
   │      └── uses ──> Inspection Method "IM-VIS"   Visual Inspection
   │
   ├── Sampling Procedure "SP-05"          AQL 1.0 · Level II
   ├── Dynamic Mod. Rule "DMR-Q10"         Skip after 10 pass
   └── Certificate Profile "CP-4711"       Outbound QM cert

Plant 1000
   │
   └── Inspection Plan "Group 50 / Cnt 1"   Material 4711
          │
          ├── Operation 0010   Incoming Dim. Check
          │      ├── Insp. Char. 10   Ø25±.02mm   ── copied from ──> IC "IC-DIA"
          │      ├── Insp. Char. 20   Ø10±.05mm   ── copied from ──> IC "IC-DIA"
          │      └── Insp. Char. 30   No Burrs    (no master ref.)
          │
          └── Operation 0020   Surface Inspection
                 └── Insp. Char. 10   Ra≤1.6µm    ── copied from ──> IC "IC-SURF"

Design principle: Keep Inspection Characteristics client-level and reusable. An IC only becomes plant/material-specific the moment it is copied into an operation as an Insp. Char. — the master itself stays generic so the same “IC-DIA” can serve every plant and material that measures a diameter the same way.

1.4 Integration with Other Master Data Objects#

The Master Inspection Characteristic sits at the intersection of the QM foundation layer and the planning layer. It draws from Catalogs and Inspection Methods, and feeds into Inspection Plans, which in turn activate on Material Masters.

Part 2: QM-Specific Field Details#

2.0 Scope of QM Ownership#

Legend: ◎ = Owner / Critical, ○ = Direct involvement

2.1 General Data#

General Data forms the identity layer of the MIC. These fields determine how the characteristic is identified, where it is valid, and whether it is available for use in Inspection Plans.

2.2 Control Indicators#

Control Indicators are the technical core of the MIC. They define exactly how the characteristic is measured, what constitutes a passing result, and how the system evaluates results to determine acceptance or rejection of an inspection lot.

2.3 Catalog Assignment#

Catalog Assignment links the MIC to pre-defined code sets from the Catalog master (QS41). These assignments determine which defect codes, cause codes, and action codes inspectors can select during results recording, and which usage decisions are available when closing an inspection lot characteristic.

Prerequisite: Catalog selected sets must exist in QS41 before they can be assigned to MICs. Catalog setup (QM-A02-01) must be completed before MIC creation in every project. Attempting to assign a non-existent selected set causes a hard error at MIC save.

2.4 Version Management#

Version Management allows the MIC to evolve over time — for example, when engineering tolerances are tightened, a new version of the MIC becomes effective on a given date while historical inspection lots retain their original specification for traceability. This is one of the most operationally critical features of the MIC compared to characteristics defined inline in an Inspection Plan.

What to Read Next#

L1) Big Picture

L2-A) Master Data

L2-B) Transaction