• ENSFunctionalErrorSerializer can handle responses without OriAttValER14 attribute and added "code" attribute

• Adds missing attributes Id, NombreDeclarante, NifDeclarante for EXS

• Updated xml signing to match the expected versions V5 (ens) and V2 (exs)
• Adds Id, NombreDeclarante and NifDeclarante to serializers (new attrs expected for API V5)
• Updates WSDLS to V5/V2, tests, etc.

cusoffsent740 (Customs Office SubsequentEntry) is set as not required

• Reorder plugins to store raw xml without signature

• Adds context to result objects including exceptions, raw_response and raw_request by default

• Adds EXS Presentation, Modification and Cancellation

• Split Serializers into Validators (validate input data) and Serializers (serialize AEAT responses)
• Several fixes

• Adds ENS Modification Schema
• Adds EXS Schema