This command is alternative for $apply, which is not existing in BSL

This allow you to create simple grouping

 

Aggregate as sum(), average() and so on current not supported

 

How to use:

$groupby=fieldname,fieldname ...

 

Example:

List of all Measurements in QC order (QC by Measurements)
 

odata4/QCOrderMeasurement?
$select=PosText,QCDescription,QCInfo
&$filter=DocEntry eq 1408
&$orderby=Sort asc
&$groupby=PosText,QCDescription,QCInfo,Sort