Error while loading worker assignment department

Summary:

Hi Experts,

We are getting an error while uploading the Worker.dat file.

The record referenced by the foreign key attribute OrganizationId wasn't found. Either specify a valid foreign key or create the referenced record first.

The record referenced by the foreign key attribute OrganizationId wasn't found. Either specify a valid foreign key or create the referenced record first.
The record referenced by the foreign key attribute OrganizationId wasn't found. Either specify a valid foreign key or create the referenced record first.

Code:

METADATA|Assignment|SourceSystemOwner|SourceSystemId|ActionCode|EffectiveStartDate|EffectiveEndDate|EffectiveSequence|EffectiveLatestChange|WorkTermsAssignmentId(SourceSystemId)|AssignmentType|AssignmentName|AssignmentNumber|AssignmentStatusTypeCode|BusinessUnitShortCode|WorkerCategory|AssignmentCategory|JobCode|LocationCode|ManagerFlag|OrganizationId(SourceSystemId)|PeriodOfServiceId(SourceSystemId)|PersonId(SourceSystemId)|DateStart|WorkerType|LegalEmployerName|PersonTypeCode|SystemPersonType|PrimaryAssignmentFlag|PrimaryFlag|ReasonCode|InternalOfficeNumber|NormalHours|Frequency|DateProbationEnd|ReportingEstablishment|GradeCode|PositionCode|ProbationPeriod|ProbationUnit|GradeId|NoticePeriodUOM|CollectiveAgreementIdCode|FullPartTime