Adding multiple Activity Type in the Blocking Condition

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Dear Experts ,

   We are currently working on a scenario in which we need to add multiple activity types to the blocking condition . That is in Blocking conditions we are providing Field as" Activity Type(aworktype)" , condition "In" and in Value we are providing Activity type_Label as the field . It would be a help if some one could provide me a possible way or workaround to add multiple Activity Types to the blocking condition for this scenario .

Regards,

Prashant Singh Bhadauria