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I am unable to close any opportunity. When I am update the stage From Estimation to Proposal then got a Business Process Error .
Please suggest how to fix the issue.
Unhandled exception: Exception type: System.ServiceModel.FaultException`1[Microsoft.Xrm.Sdk.OrganizationServiceFault]Message: An unexpected error occurred from ISV code. (ErrorType = ClientError) Unexpected exception from plug-in (Execute): PSA_Plugins.transactioncurrencyRetrieve: System.Runtime.Serialization.SerializationException: Element 'schemas.datacontract.org/.../System.Collections.Generic:value' contains data from a type that maps to the name 'Microsoft.Crm.Sdk:OptionalParameter'. The deserializer has no knowledge of any type that maps to this name. Consider changing the implementation of the ResolveName method on your DataContractResolver to return a non-null value for name 'OptionalParameter' and namespace 'Microsoft.Crm.Sdk'.Detail:
This looks like an issue from one of the Microsoft's plugins on PSA itself. I suggest you open a ticket with Microsoft on the same.
Hope this helps.
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