Search Results mr_route_sequence_id

Overview

The AHL_MR_ROUTE_SEQUENCES table is a core data object within the Oracle E-Business Suite (EBS) module for Complex Maintenance, Repair, and Overhaul (AHL). It serves a critical function in defining and managing the operational workflow for maintenance tasks. Specifically, this table stores the sequential relationships between different routes that are attached to a single maintenance requirement (MR). It enables the definition of complex, multi-step maintenance procedures where certain routes must be performed before or after others, ensuring that maintenance activities are executed in a precise, logical, and controlled order as mandated by engineering or regulatory standards.

Key Information Stored

The table's primary purpose is to establish precedence between related maintenance routes. Its central entity is the MR_ROUTE_SEQUENCE_ID, a unique system-generated identifier serving as the primary key. The table's structure is defined by two essential foreign key relationships. The MR_ROUTE_ID column identifies the primary maintenance route to which a sequence rule applies. The RELATED_MR_ROUTE_ID column identifies a secondary, related maintenance route. The relationship between these two columns defines the sequence, typically interpreted as the RELATED_MR_ROUTE_ID being a predecessor, successor, or parallel step to the MR_ROUTE_ID. While the provided metadata does not list additional descriptive columns, such as SEQUENCE_NUMBER or RELATIONSHIP_TYPE, the table's documented purpose confirms it is the repository for this sequencing logic.

Common Use Cases and Queries

This table is pivotal for generating work orders and scheduling in a maintenance environment. A common use case is querying the complete procedural sequence for a complex maintenance job to create a detailed work plan or to validate that all prerequisite steps are completed before authorizing a subsequent task. For instance, a report might list all routes for a given MR in their required execution order. A typical analytical query would join AHL_MR_ROUTE_SEQUENCES to AHL_MR_ROUTES (twice) to resolve the route identifiers into meaningful route titles or codes.

Sample Query Pattern:
SELECT prim.route_code AS Primary_Route,
       rel.route_code AS Related_Route
FROM AHL_MR_ROUTE_SEQUENCES seq,
     AHL_MR_ROUTES prim,
     AHL_MR_ROUTES rel
WHERE seq.mr_route_id = prim.mr_route_id
  AND seq.related_mr_route_id = rel.mr_route_id
  AND prim.mr_header_id = :p_mr_id
ORDER BY [sequence logic];

Related Objects

The AHL_MR_ROUTE_SEQUENCES table has a tightly integrated relationship with the AHL_MR_ROUTES table, which stores the master definition of individual maintenance routes. As documented, there are two distinct foreign key constraints linking to this parent table:

• Foreign Key from AHL_MR_ROUTE_SEQUENCES.MR_ROUTE_ID to AHL_MR_ROUTES. This links the sequence record to the primary maintenance route.
• Foreign Key from AHL_MR_ROUTE_SEQUENCES.RELATED_MR_ROUTE_ID to AHL_MR_ROUTES. This links the sequence record to the related maintenance route involved in the sequence rule.

This design means that both ends of a sequence relationship must be valid, defined routes. The table is a child of AHL_MR_ROUTES, and its integrity is dependent on the existence of records in that master table. Data in this table is typically created and managed via the AHL module's user interface for defining maintenance requirements and their associated routes.