I have tried the official copy referenced in the submission and composition reference guide with no luck (below):
Ken,
I am working on software for the 1094/1095C forms and just got my scenario 3 (3-0, 3-1, 3-2, 3-3) accepted. I sent the IRS an email on Friday regarding their regex pattern for the UniqueTransmissionId. I'm not sure if they fixed the pattern in their schema, but I had the same error as you last week. My manifest file still doesn't validate against the published XSD. However, today, I was able to get pass the error and both the manifest file and form data file were accepted via the UI channel.
Here's the accepted manifest file without my personal info.
719f5624-e78c-487e-a6ce-1686e9ff3f35:SYS12:AAAAA::T
2015-12-14T20:54:42Z
2016
0
10digitEIN
O
T
0
Your Company Name
YOUR COMPANY NAME
YOUR ADDRESS
HOUSTON
TX
12345
YourFirstName
MiddleI
YourLastName
YourPhone
V
YourFirstName
MiddleI
YourLastName
YourPhone
3
1
YourSoftwareId
1094/1095C
application/xml
e074db4e92ffddeac8d93a686a2a0e1d
13275
1094C_Request_AAAAA_20151214T205442000Z.xml
I'm new to posting on here (my first response was actually deleted by the moderators), so please bear with me as I try to get the posting correct.