Set value into Amount and Quantity fields
Values cannot be set directly in the main Amount and Quantity fields, as these fields require a specific format that includes both a 'Value' and a 'Unit of Measure.
However, the attribute list contains a special version of the field, ending with "Value", which holds only the numerical value. This version allows you to set values with business rules.
Example
If you want to fill in the "VATAmountBase" in VAT Entries entity, you must create a Business Rule that sets the value in the "VATAmountBaseValue" instead.
More Information
For further details about Amount and Quantity data types, refer to the model documentation: