Are there any restrictions or rules on CMS EHR Certification ID numbers generated from the CHPL site, such as number of characters expected, acceptable characters, etc? As a vendor we have users input this number in our portal to go on the QRDA files but we currently don't have any restrictions on acceptable numbers that we'll allow to be entered. We've had cases where there would be an extra space at the end, missing characters, or a CCN being entered that would get rejected during submissions. Thanks