Not able to change employee type while doing global transfer through HDL

Trying to upload a new global transfer record while changing the worker type from Employee to Contingent Worker through HDL.
However, I'm encountering an error stating, "You can't change the worker type during a global transfer or when adding a global temporary assignment."

Here is a sample HDL used for this process:

METADATA|WorkRelationship|SourceSystemId|SourceSystemOwner|LegalEmployerName|PersonNumber|DateStart|WorkerType|ActionCode|ActualTerminationDate|PrimaryFlag|GlobalTransferFlag|TerminateWorkRelationshipFlag
MERGE|WorkRelationship|WR_305177-1|WORKDAY|(EMEA) Limited|305177|2023/12/01|C|GLB_TRANSFER|||Y|

METADATA|WorkTerms|AssignmentNumber|AssignmentName|SourceSystemId|SourceSystemOwner|PeriodOfServiceId(SourceSystemId)|PersonNumber|EffectiveStartDate|EffectiveLatestChange|EffectiveSequence|EffectiveEndDate|ActionCode|PrimaryWorkTermsFlag
MERGE|WorkTerms|ET305177-1|ET305177-1|WT_305177-1|WORKDAY|WR_305177-1|305177|2023/12/01|Y|1|4712/12/31|GLB_TRANSFER|Y