Merge pull request #437 from tjeb/CII_Credit_Payment_instructions_variable_name_fix

Fix variable name for $Credit_Payment_instructions

Author: oriol

cii/schematron/abstract/EN16931-CII-model.sch

@@ -141,7 +141,7 @@
   <rule context="$Payment_instructions ">
     <assert test="$BR-49" flag="fatal" id="BR-49">[BR-49]-A Payment instruction (BG-16) shall specify the Payment means type code (BT-81).</assert>
   </rule>
-  <rule context="$Credit_Payment_instructions">
+  <rule context="$Credit_Payment_instructions ">
     <assert test="$BR-CO-27" flag="fatal" id="BR-CO-27">[BR-CO-27]- Either the IBAN or a Proprietary ID (BT-84) shall be used.</assert>
   </rule>
   <rule context="$Preceding_Invoice ">