Default value in the group picker field should not be removed

Question

Hi Team, 
 I have a group Picker field and there is a condition that if mkv = 'mk-3475' by default it should select a group called Keytruda writers. The users who is working on this interface cannot remove this group but they can add more groups along with this. 
 Can some one help how I can achieve this. 
 a!pickerFieldGroups(
 required: true,
 label: "Assignee(s)",
 helpTooltip: if(
 and(
 or(
 ri!lrrf['recordType!{a8fd253d-0e45-428b-af5f-cdd4c2b27a87}RGRACSLBL LRRF.fields.{57e16ccd-ed38-46b5-9fb7-8f5cfca177c9}reviewType'] = cons!RGRACSLBL_LRRF_REVIEW_TYPES[1],
 ri!lrrf['recordType!{a8fd253d-0e45-428b-af5f-cdd4c2b27a87}RGRACSLBL LRRF.fields.{57e16ccd-ed38-46b5-9fb7-8f5cfca177c9}reviewType'] = cons!RGRACSLBL_LRRF_REVIEW_TYPES[2]
 ),
 ri!lrrf['recordType!{a8fd253d-0e45-428b-af5f-cdd4c2b27a87}RGRACSLBL LRRF.fields.{2ebc42d8-fe25-490b-879a-dcf755894066}country'] = cons!RGRACSLBL_EUROPEAN_UNION
 ),
 cons!RGRACSLBL_CONS_LRRF_GLL_HELPER,
 {}
 ),
 groupFilter: if(
 ri!lrrf['recordType!{a8fd253d-0e45-428b-af5f-cdd4c2b27a87}RGRACSLBL LRRF.fields.{296074dc-1b66-4d21-a91f-0cc9c8a771f2}mkv'] = cons!RGRACSLBL_KEYTRUDA,
 a!hiddenField(
 value: cons!RGRACSLBL_GROUP_KEYTRUDA_WRITERS
 ),
 {}
 ),
 value: rule!APN_distinct(ri!assignees),
 saveInto: a!save(
 ri!assignees,
 rule!APN_distinct(save!value)
 ),
 
)

Kumar Agniwesh · Answer

So if I have understood you want to add that 1 group by default in ri!assignees if it matches the condition and also one of the groups selected by user. 
 While user is searching and selecting the group they want, you can run a condition in saveinto part to check if it matches your condition and then you add that group in your rule input. a!localVariables(
 local!assignees,
 {
 a!pickerFieldGroups(
 label: "Group Picker",
 labelPosition: "ABOVE",
 saveInto: {
 local!assignees,
 if(
 true(),
 a!save(
 local!assignees,
 union(
 append(local!assignees, togroup(465)),
 append(local!assignees, togroup(465))
 )
 ),
 null()
 )
 },
 value: local!assignees,
 validations: {},
 
 )
 }
)