BR-O-03 CII doesn't check absence of BT-48 field

[jaramend]

The rule BR-O-03 for CII format is incorrect.
The XPath for BT-48 field is incorrect in the test and so the check that this field is absent doesn't work (always true).

Actual implementation (for BT-48 field only) :
not (/ram:BuyerTradeParty/ram:SpecifiedTaxRegistration/ram:ID[@schemeID = 'VA'])

Solution :
not (//ram:BuyerTradeParty/ram:SpecifiedTaxRegistration/ram:ID[@schemeID = 'VA'])