Hi,

I have a field Primary Phone which is a picklist. I have phone 1, phone 2,3,4 in master object. I should update a field in child such that if Primary Phone is selected as phone 1, value should be prepopulated in child's field, if selected t phone 2, value in child object's field is phone 2 and so on. 

I have tried the following and there were no errors and save was successful. But primary phone field(which is child field) is not getting any value.

-------  Using IF -----------

IF(ISPICKVAL( Household_Name__r.Primary_Phone_Identifier__c,"Phone 1" ),Household_Name__r.Phone,
IF(ISPICKVAL( Household_Name__r.Primary_Phone_Identifier__c,"Phone 2" ),Household_Name__r.Phone_2__c,
IF(ISPICKVAL( Household_Name__r.Primary_Phone_Identifier__c,"Phone 3" ),Household_Name__r.Phone_3__c,
IF(ISPICKVAL( Household_Name__r.Primary_Phone_Identifier__c,"Phone 4" ),Household_Name__r.Phone_4__c,NULL)))
)

-------------------------------------------

------------- Using Case ---------------------------

CASE(ISPICKVAL( Household_Name__r.Primary_Phone_Identifier__c,"Phone 1" ) , Phone 1, Household_Name__r.Phone ,
ISPICKVAL( Household_Name__r.Primary_Phone_Identifier__c,"Phone 2" ) , Phone 2, Household_Name__r.Phone_2__c ,
ISPICKVAL( Household_Name__r.Primary_Phone_Identifier__c,"Phone 3" ) , Phone 3, Household_Name__r.Phone_3__c ,
ISPICKVAL( Household_Name__r.Primary_Phone_Identifier__c,"Phone 4" ) , Phone 4, Household_Name__r.Phone_4__c ,
NULL)

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Help me with IF condition. Is it valid to write a ISPICKVAL on parent's field in child object's field?

Any help will be appreciated.