In my session after enabling standard command set with delete option,
if I select single record Delete option is not enabling and if I select multiple records delete option is enabling but even so option is enabling the records are not deleting if I click delete
Attaching images one with single record selected and other with multiple records selected.

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Probably DAL forbids to delete the records. If one record is selected, delete button is disabled because DAL checks that one selected record for delete conditions. If multiple records are selected, conditions are not checked at moment of selection, so command is enabled. Then the DAL check is executed as soon as the real delete starts. Then, if the conditions to delete the record are not satisfied, the delete is skipped.

Thanks JaapJD. It worked.