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			Defines the value of one of the attributes in an existing transaction.
			Methods allowed:

			Input parameters:
			- call = define_transaction_attribute_value
			- api_key = security key that has been assigned to client (required)
			- client_transaction_pk = primary key that is used in the client's database for 
			the new transaction (required, max 45 characters)
			- attribute_name = existing attribute name to be used 
			(required, max 45 characters)
			- attribute_value = the actual value of the attribute (the datatype must 
			correspond to what has been defined for the attribute_name)
			Return value:
			- on success returns TRUE
			web form
			This method assumes that the attribute and transaction already exist.