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you don't need to (or should) specify the ',fmp12' as part of the url. Surprised that it even responds.
What if you omit the "=" in "=100013715"}
We're getting the same error with and without the file extension, and with an implicit or explicit equals sign. The only way we've found to successfully get results is to turn off "Prohibit modification of value during data entry" on the MoPicID field.
Locking out the field in the UI would be a great deal more work, more prone to error and/or oversight, and would prevent users from copying the field. For all these reasons, we'd strongly prefer to leave that option in place.