Decomposition (SAP Business One)

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the Decomposition in SAP Business One there is a special production order type that breaks down a composite item into its individual components. The process reverses the usual production logic: the finished product is removed from inventory, the Components will be booked to the warehouse.

Context

Dismantling orders are used wherever finished assemblies need to be disassembled – typically for returns, altered customer specifications, or for the reuse of valuable components. Instead of booking the entire item as scrap, reusable parts can be systematically returned to inventory.

SAP Business One bildet das über einen Disassembly-Production order which essentially reverses the bill of materials of the finished product. The process runs in three steps:

Dismantling Order: The composite article will be booked as a material withdrawal.
Component access: The individual items are recorded as warehouse receipt.
Distribution of costs: The costs of the dismantled item are allocated proportionally to the components.

Prerequisites in master data

For a clean dismantling, several conditions must be met:

Production bill of materials (Bill of Materials) For the finished product to be disassembled, a production bill of materials of type „P" (OITT.TreeType = 'P') must exist. It serves as a blueprint for the components to be recovered and defines their standard quantities.
Master data for articles Both the finished product and all components must be correctly set up in the item master (OITM) and have a suitable valuation method (moving average, FIFO etc.).
Resources: From SAP Business One 10.0, dismantling orders may not contain resources. Working hours or machine costs must therefore be recorded separately.

Flow of a dismantling order

Create production order: Production → Production Order.
Select order type „Disassembly": In the „Type" field, „Dismantlement" is selected – this step reverses the system logic.
Enter finished product: In the „Product No." field, enter the item code of the finished product to be dismantled. The associated parts list will be loaded automatically, and the components will appear as line items.
Status „Released" Makes the order active and enables feedback.
Removal of the finished product The parent article is booked out of stock as „issue for production" – automatically upon confirmation with backflushing (ITT1.IssueMethod = 'B'), otherwise manually.
Access for Components The recovered parts are booked into stock via „goods receipt from production" at the planned quantity specified on the order.

Cost accounting and MRP effects

From a cost accounting perspective, the recovered components are valued at their current costsCurrent Costs, e.g. FIFO-layer or moving average) are included in inventory. An important special case: If components have no historical costs, they are booked with a value of zero – which can affect the average cost of the finished product and lead to discrepancies. This is a frequently overlooked stumbling block during the initial breakdown.

On the Material Requirements Planning (MRP) Disassembly has an indirect effect: it does not generate new requirements for the disassembled product, but it increases the availability of the recovered components (OITM.OnHand, OITW.OnHand). The MRP run benefits from this - fewer new procurement or production requirements arise. Since disassembly orders do not contain resources, disassembly has no impact on resource capacity planning (ORSC).

Practical tip

Decomposition orders are particularly worthwhile for high-value returns Assemblies. Instead of writing off returned items as scrap, functional components can be systematically booked back into stock — this saves materials, reduces procurement costs, and provides clearly documented inventory movements for the audit.

Demarcation

A disassembler is not a Standard production order with reversed signs — the system logic is fundamentally different and requires the explicit order type „Dismantle". It is also not compatible with a File transfer or a Stock withdrawal by goods issue to be confused with: Only the dismantling order uses the production BOM as a blueprint, allocates costs proportionally to the components, and documents the dismantling process in a traceable manner. It also differs from a Repair order, where an item is returned repaired rather than dismantled.

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