strange error with CRM Online after upgrade to 2015

Hi

I have a strange problem after the upgrade to CRM 2015 Online.
If ! have workflows with a wait condition. In this wait condition I generate a new record. In the create record step I am using the field Record URL(dynamic). Then  CRM throws following error:

Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=7.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: Unable to find metadata information for attribute !Process_Custom_Attribute_URL_Detail: 
<OrganizationServiceFault xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.microsoft.com/xrm/2011/Contracts">
<ErrorCode>-2147220970</ErrorCode>
<ErrorDetails xmlns:d2p1="http://schemas.datacontract.org/…/System.Collections.Generic" />
<Message>Unable to find metadata information for attribute !Process_Custom_Attribute_URL_</Message>
<Timestamp>2015-01-26T04:50:37.1685174Z</Timestamp>
<InnerFault i:nil="true" />
<TraceText i:nil="true" />
</OrganizationServiceFault>