There are strict rules for UID formatting and usage. If these are not followed, then some modality equipment may refuse to accept MWL results containing invalid UIDs. Some of the systems are known to filter out requests for faulty UIDs.
The most common reasons for StudyUID not being accepted by modalities in Modality Worklist response are:
Invalid StudyUID formatting including:
Leading “0”s in a component.
Each component must be capable of being represented unambiguously as either a string or an integer, so this UID is OK
1.2.822.214.171.12480043 The 0 is on its own and unambiguous
But this is not
1.2.827.0.1.03680043 The leading zero in 03680043 is superfluous and illegal
StudyUID in the wrong attribute (it must be a top level attribute, not within a sequence)
Further cautions and information about StudyUID in MWL results:
For more details on UIDs, please see article on UID Rules