Change Password of DPM SSRS account

Problem:

You want to change or have already changed the DPM SQL Reporting Services account password DPMR$<DPMSERVERNAME> after initial install of DPM.

Now when you try to access DPM reports you get this error:

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An error has occurred during report processing. (rsProcessingAborted)

Cannot impersonate user for data source ‘DLS’. (rsErrorImpersonatingUser)

Log on failed. Ensure the user name and password are correct. (rsLogonFailed)

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