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.
<?xml version="1.0" encoding="UTF-8"?>
<p:ACAUIBusinessHeader xmlns:p="urn:us:gov:treasury:irs:msg:acauibusinessheader" xmlns:acaBusHeader="urn:us:gov:treasury:irs:msg:acabusinessheader" xmlns="urn:us:gov:treasury:irs:ext:aca:air:7.0" xmlns:irs="urn:us:gov:treasury:irs:common" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:us:gov:treasury:irs:msg:acauibusinessheader IRS-ACAUserInterfaceHeaderMessage.xsd ">
<acaBusHeader:ACABusinessHeader>
<UniqueTransmissionId>719f5624-e78c-487e-a6ce-1686e9ff3f35:SYS12:AAAAA::T</UniqueTransmissionId>
<irs:Timestamp>2015-12-14T20:54:42Z</irs:Timestamp>
</acaBusHeader:ACABusinessHeader>
<ACATransmitterManifestReqDtl>
<PaymentYr>2016</PaymentYr>
<PriorYearDataInd>0</PriorYearDataInd>
<irs:EIN>10digitEIN</irs:EIN>
<TransmissionTypeCd>O</TransmissionTypeCd>
<TestFileCd>T</TestFileCd>
<TransmitterForeignEntityInd>0</TransmitterForeignEntityInd>
<TransmitterNameGrp>
<BusinessNameLine1Txt>Your Company Name</BusinessNameLine1Txt>
</TransmitterNameGrp>
<CompanyInformationGrp>
<CompanyNm>YOUR COMPANY NAME</CompanyNm>
<MailingAddressGrp>
<USAddressGrp>
<AddressLine1Txt>YOUR ADDRESS</AddressLine1Txt>
<irs:CityNm>HOUSTON</irs:CityNm>
<USStateCd>TX</USStateCd>
<irs:USZIPCd>12345</irs:USZIPCd>
</USAddressGrp>
</MailingAddressGrp>
<ContactNameGrp>
<PersonFirstNm>YourFirstName</PersonFirstNm>
<PersonMiddleNm>MiddleI</PersonMiddleNm>
<PersonLastNm>YourLastName</PersonLastNm>
</ContactNameGrp>
<ContactPhoneNum>YourPhone</ContactPhoneNum>
</CompanyInformationGrp>
<VendorInformationGrp>
<VendorCd>V</VendorCd>
<ContactNameGrp>
<PersonFirstNm>YourFirstName</PersonFirstNm>
<PersonMiddleNm>MiddleI</PersonMiddleNm>
<PersonLastNm>YourLastName</PersonLastNm>
</ContactNameGrp>
<ContactPhoneNum>YourPhone</ContactPhoneNum>
</VendorInformationGrp>
<TotalPayeeRecordCnt>3</TotalPayeeRecordCnt>
<TotalPayerRecordCnt>1</TotalPayerRecordCnt>
<SoftwareId>YourSoftwareId</SoftwareId>
<FormTypeCd>1094/1095C</FormTypeCd>
<irs:BinaryFormatCd>application/xml</irs:BinaryFormatCd>
<irs:ChecksumAugmentationNum>e074db4e92ffddeac8d93a686a2a0e1d</irs:ChecksumAugmentationNum>
<irs:AttachmentByteSizeNum>13275</irs:AttachmentByteSizeNum>
<DocumentSystemFileNm>1094C_Request_AAAAA_20151214T205442000Z.xml</DocumentSystemFileNm>
</ACATransmitterManifestReqDtl>
</p:ACAUIBusinessHeader>
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.
Update
2016 Version of the Test Scenarios have been posted here:
https://blog.boomtax.com/2016-irs-air-test-scenario-xml-iss-ui/
2015 Version of AATS Test Scenarios
https://blog.boomtax.com/irs-air-test-scenario-xml-sample-files/