Do Sales Order Customer Qualifier only apply to SSD programs? Does it work with Load Invoiced SOs?

Summary:

Do Sales Order Customer Qualifier only apply to SSD programs?

Does it work with Load Invoiced Sales orders?

We want to use sales order EFF as custom qualifier as mentioned in

In another closed thread, there is mention that these only work for SSD programs, is it available for Customer Promotion program when using Load invoiced sales order?

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