Definition

Products belonging to one FFF class can be replaced by products belonging to another FFF class only if you have maintained a group with restricted interchangeability between FFF classes. This is a special type of interchangeability group wherein FFF classes can be group members.

Use

The aerospace industry has special conditions that have to be met before products can substitute for one another. These can be complex conditions such as type of aircraft or the location in which the product is being replaced. For example, if you need to use a certain product near the engine, you can only use products that are able to withstand high temperatures. These substitution restrictions are mapped in the SAP APO system using conditional substitution or restricted interchangeability between FFF classes.

Structure

The item data of every group with restricted interchangeability between FFF classes comprises the predecessor group/product, successor group/product, and master data attributes.

One member of the interchangeability group must be an FFF class, whereas the other members can be FFF classes or products.

The following master data attributes are required to create a group with restricted interchangeability between FFF classes:

For more information about these master data attributes, see Supersession Chain .

For more information about header and item data, see Interchangeability Group Types .

Integration

Restricted interchangeability between FFF classes is currently not supported by any application in SAP APO.

Example

FFF class A contains screws made of alloy A from different manufacturers.

FFF class B contains screws made of alloy B from different manufacturers.

Condition: operating temperature less than 70 degrees.

That means that screws made of alloy A (FFF class A) can be replaced by screws made of alloy B (FFF class B) if the operating temperature is less than 70 degrees.