Non-standard readmulti operations take a partial key struct and a details struct as input meta-model parameters. They return a list of the provided details struct; every record matching the criteria is returned in the list.
The only difference between a non-standard readmulti and a standard readmulti is that a non-standard readmulti must specify a return value whereas for a standard readmulti this is assumed to be the standard generated details struct for the entity. For non-standard readmulti the developer is required to specify a struct as the return value of the operation. The fields of this struct must be a subset of the fields of the entity.