A polite tiff has broken out between the U.S. Postal Service and its inspector general over whether a pension should count in determining whether a top officer’s compensation exceeded a legal pay cap. The officer, who was not named in the report, but whom sources identified as Paul Vogel, president of digital solutions, made a total last year of $306,250 in annual salary, pension and bonus, IG auditors found in a newly released report. That would be well above the maximum pay limit of $276,840 for USPS executives holding specially designated “critical” positions, according to the audit, which said the Postal…