FOR LOOKUP:::
STEP 1: Create one custom field in Child Object with Uniq option.
STEP2:CREATE WorkFlow Rule on Child object and Criteria is Created or edited .
In fields:select the Parent is notnull click on save&next button.
STEP3: Choose field update option.
STEP4: Choose use-formula: and select the parentobject and click on save and active the Workflow.
MASTERDETAILS:
Create Rollupsummay field on Parent and write validation if Roll up summary is greater than one throw error message
STEP 1: Create one custom field in Child Object with Uniq option.
STEP2:CREATE WorkFlow Rule on Child object and Criteria is Created or edited .
In fields:select the Parent is notnull click on save&next button.
STEP3: Choose field update option.
STEP4: Choose use-formula: and select the parentobject and click on save and active the Workflow.
MASTERDETAILS:
Create Rollupsummay field on Parent and write validation if Roll up summary is greater than one throw error message
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