From SAP Help:
Creating Matchcodes
Procedure
You can display the matchcode maintenance screen from the initial screen of the ABAP Dictionary. Choose Utilities ® Further Dictionary objects.
A dialog box appears.
Select the object type Matchcode object and enter a four-place name. Choose Create.
The maintenance screen for matchcode objects appears. All other steps are described based on this maintenance screen.
To create a matchcode, you must first create a matchcode object and then create one or more matchcode Ids for this matchcode object.
Procedure for Creating Matchcode Objects
Define the attributes of matchcode objects
Select the secondary tables of matchcode objects
Select the fields of matchcode objects
Activate the matchcode objects
Procedure for Creating Matchcode IDs
Define the attributes of matchcode IDs
Select the secondary tables of matchcode IDs
Select the fields of matchcode IDs
Define the selection conditions of matchcode IDs (optional)
Activate the matchcode IDs
Depending on the selected update type of the matchcode IDs of a matchcode object, you have to define further structures or carry out certain actions:
Update types A, S or P: build matchcode data
Update Type I: create matchcode indexes
Update type K: Create a function module for a matchcode ID
Building Matchcode Data
Prerequisites
In physical matchcodes (update types A, S or P), the matchcode data is stored redundantly in separate tables in the system. You have to build these tables after you have created and activated the matchcode object and the matchcode IDs. The tables are built and deleted using the matchcode utility (report SAPMACO). The procedure used to build the tables is the same for all physical update types (A, S or P).
The matchcode utility operates globally across all clients. A parameter controls whether matchcodes are to be built or deleted for a specific client or for all clients. The utility also permits matchcodes to be built for all matchcode objects at one time.
Procedure
Choose Utilities ® Matchcode data ® Build in the maintenance screen of the matchcode object. You can also call report SAPMACO directly.
Follow the instructions in the F1 help. It describes how to fill in the input template. Execute the report.
Check whether the matchcode data was built correctly. You can see this in Displaying the Built Matchcode Data.
Transparent matchcode IDs (update type I) and classification matchcode IDs (update type K) are not stored physically. Therefore, there is no reason to build such IDs with the matchcode utility.
Bluesky
