Auto Translation Property having junk values

Do you have any idea, how you got there?

AutoTranslationCurrencies can be set by scenariotype and manually only allows you to select application currencies. Had your application other currencies in the past? Is it possible, that your metadata have a spaces in the quotes? This can happen, if you generated the metadata with an excel template.

<property name="AutoTranslationCurrencies" scenarioType="" value=" " />
instead of
<property name="AutoTranslationCurrencies" scenarioType="" value="" />

If you have a space, it might be responsible for your problem, another load with "" should solve the problem.

If this is not working, you can use a business rule to clear the auto translate setting.

But please test it extensively before running the business rule on a productive application.

Dim dimPkOfDimension As DimPk = BRApi.Finance.Dim.GetDimPk(si, "YourEntityDim")
Dim parentMemberId As Integer = BRApi.Finance.Members.GetMemberId(si, dimtypeid.Entity, "YourTopEntity")
Dim listOfEntityMembers As List(Of Member) = BRApi.Finance.Members.GetDescendants(si, dimPkOfDimension, parentMemberId)
For Each entityMember As Member In listOfEntityMembers
	Dim entityMemberInfo As MemberInfo = BRApi.Finance.Metadata.GetMember(si, DimTypeId.Entity, entityMember.MemberId, True)
	entityMemberInfo.GetEntityProperties.AutoTranslationCurrencies.RemoveAllStoredPropertyItems
Next

It worked on my demo application.

Yes, an extender BR is perfect. If you place it under unknown, you can run it directly from the BR.