Vendor Item Import with R1 updates - import fails for some expense items

Vendor Item Import with R1 updates - import fails for some expense items. The log shows the following error:

• • Error : 2/23/2019 4:19:55 AM : Vendor Item Data Import on 2/23/2019 4:19:55 AM : <E: Record Import Failed with error :E> The UPDATE statement conflicted with the FOREIGN KEY constraint "FK_tbVendorEntityItem_tbUnitOfMeasure". The conflict occurred in database "CFAStaging", table "dbo.tbUnitOfMeasure", column 'UnitOfMeasureID'.
    The UPDATE statement conflicted with the FOREIGN KEY constraint "FK_tbEntityItem_tbUnitOfMeasure2". The conflict occurred in database "CFAStaging", table "dbo.tbUnitOfMeasure", column 'UnitOfMeasureID'.
    The statement has been terminated.
    The statement has been terminated.

Example: 

VendorCode|ItemCode|VendorItemCode|VendorDescription|{UpdateVendorEntityItem}{DefaultToReportingUnit}{UpdateFromItem}{AddUOMMapping}{UpdateEntityItem}PurchaseUnit|VendorPrice|IntroductionDate|DiscontinueDate|AutoUpdateEntityPrice|AutoUpdateEntityUnit|{UpdateVendorEntityItem}PerformStockCount|{UpdateVendorEntityItem}{UpdateEntityItem}StockTakeInner|{UpdateVendorEntityItem}SetCostToLastPurchasePrice|{UpdateVendorEntityItem}ReplacedVendorItemCode
184774|016749|016749|TOWEL, ROLL||0|2009/08/13 00:00:00|4712/12/31 00:00:00|N|N|N||Y|