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Registering a new MRU entity is done by following the steps below:

First, set the 'MruTableNames' application setting (comma-separated list) to include the table name(s) for which you want to register a new entity.
This can be done in SWAT either in the .restapplicationsettings file, either in the Application Settings Desktop (from UI, if available).

Build.One Documentation > MRU (Most Recently Used) Tutorial > image2022-5-9_12-14-45.png

Second, in the RecordHdlHelper class, the following method is used to determine the container opened on record double click in the data view: GetContainerOfHdl.
The RecordHdlHelper class uses the IEntityMetadataService.

In the legacy implementation provided in SWAT (LegacyEntityMetadataService.cls) it must be specified which screen opens based on the table Id.

(in thie example below, profileW opens for table ZUser with id '012'; id is usually the first part of the selfHdl).

Finally, on the DSO used in the screen, set the EventAfterFetch to the following: '$ akioma.registerMruEntryFromBE(self);'.
This will call a function in the MruBT.cls which will do the registering in the MRU table.
The data source needs its index to point to a valid record in order for the register to work.

Build.One Documentation > MRU (Most Recently Used) Tutorial > image2022-5-9_12-15-29.png

After those steps are followed, the new MRU entities will show up in the MRU Data View.

Build.One Documentation > MRU (Most Recently Used) Tutorial > image2022-5-9_12-16-37.png

Once you double-click on an item, it will open the screen specified above.

IMPORTANT: Double-clicking on an item from the MRU data View will only work if the dataSource has one of the following fields: selfhdl, refhdl or childhdl.