Mandatory in an optional sequence
This field specifies the type of unit and the quantity of the precious metal bought by the Sender.
Unit must contain one of the following codes (Error code(s): T06):
Amount must not contain more than six digits following the decimal comma (Error code(s): C89).
The integer part of Amount must contain at least one digit. The decimal comma ',' is mandatory and is included in the maximum length (Error code(s): T40, T43).