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That's what salesforce does. In our app we're on version 47.0 of their API https://test.salesforce.com/services/Soap/c/47.0 And in the latest version of the API docs they have details regarding old versions. Example: https://developer.salesforce.com/docs/atlas.en-us.api.meta/a... Type
reference
Properties
Create, Filter, Group, Nillable, Sort
Description
The ID of the parent object record that relates to this action plan. For API version 48 and later, supported parent objects are Account, AssetsAndLiabilities, BusinessMilestone, Campaign, Card, Case, Claim, Contact, Contract, Financial Account, Financial Goal, Financial Holding, InsurancePolicy, InsurancePolicyCoverage, Lead, Opportunity, PersonLifeEvent, ResidentialLoanApplication, and Visit as well as custom objects with activities enabled. For API version 47 and later, supported parent objects are Account, BusinessMilestone, Campaign, Case, Claim, Contact, Contract, InsurancePolicy, InsurancePolicyCoverage, Lead, Opportunity, PersonLifeEvent, and Visit as well as custom objects with activities enabled. For API version 46 and later, supported parent objects are Account, Campaign, Case, Contact, Contract, Lead, and Opportunity as well as custom objects with activities enabled. For API version 45 and earlier: the only supported parent object is Account. |