Search Results qa_control_limits

Overview

The QA_CONTROL_LIMITS table is a core data repository within the Oracle E-Business Suite (EBS) Quality (QA) module, specifically for versions 12.1.1 and 12.2.2. Its primary function is to store the statistical control limits used in the generation and maintenance of quality control charts. These charts are essential tools for statistical process control (SPC), enabling organizations to monitor manufacturing and business processes for stability, identify variations, and ensure products meet defined quality specifications. The table acts as a child entity, linking specific control limit values to broader quality criteria definitions, thereby forming a foundational element of the module's analytical and compliance reporting capabilities.

Key Information Stored

The table's structure is designed to uniquely define and associate control limits with a quality specification. The primary key, CONTROL_LIMIT_ID, ensures each record is uniquely identifiable. The most critical foreign key column is CRITERIA_ID, which links the control limit set to a specific quality specification defined in the QA_CRITERIA_HEADERS table. While the exact column list is not fully detailed in the provided metadata, typical data stored would include values for upper and lower control limits (UCL, LCL), upper and lower warning limits, and the target or nominal value for a characteristic. Additional columns likely specify the chart type (e.g., X-Bar, R, P, U charts) and the specific characteristic or test the limits apply to, enabling the system to retrieve the correct limits for chart rendering and out-of-control condition analysis.

Common Use Cases and Queries

The primary use case is the dynamic population of control charts during data collection and review. When a quality result is recorded, the application queries this table to retrieve the relevant limits for charting. Common reporting queries involve identifying specifications with defined control limits or auditing limit values. A typical SQL pattern to retrieve all control limits for a specific criteria would be:

SELECT qcl.* FROM qa_control_limits qcl WHERE qcl.criteria_id = :p_criteria_id ORDER BY qcl.control_limit_id;

Another frequent operational query is joining with collection plan data to validate that in-process charts have the correct limits applied, supporting quality assurance audits and process validation activities.

Related Objects

The QA_CONTROL_LIMITS table has defined relationships with other key Quality module tables, as per the provided metadata. The principal relationship is a foreign key dependency on the QA_CRITERIA_HEADERS table.

• QA_CRITERIA_HEADERS: This is the primary parent table. The relationship is established via the column QA_CONTROL_LIMITS.CRITERIA_ID, which references the QA_CRITERIA_HEADERS table. This link ensures that every set of control limits is associated with a valid quality specification or collection element header. The table may also be referenced by various Quality module forms, reports, and underlying PL/SQL packages responsible for chart calculations and quality plan execution, though these are not explicitly listed in the structural metadata provided.