The interface generated to the connector follows the SAP ABAP conventions. All specifications described below are generated to the SAP connector automatically, though you can create them manually if needed.
Each SAP ABAP function has four parameter sections:

import (input)
export (output)
changing (input/output)
tables (input/output)

These parameters are mapped to the input and output parameters of the SAP adapter:

Name	Type	Direction	Description
connectionString	String	in	Supplies the connection string (optional).
import	Any	in	The class specifying the type of this parameter must have stereotype SAP Parameters. The attributes and associations of this class correspond to the parameters given by the import section of the ABAP function declaration.
export	Any	out	The class specifying the type of this parameter must have stereotype SAP Parameters. The attributes and associations of this class correspond to the parameters given by the export section of the ABAP function declaration (see the export parameters in SAP).
changing	Any	in/out	The class specifying the type of this parameter must have stereotype SAP Parameters. The attributes and associations of this class correspond to the parameters given by the changing section of the ABAP function declaration
tables	Any	in/out	The class specifying the type of this parameter must have stereotype SAP Tables. The attributes and associations of this class correspond to the parameters given the tables section of the ABAP function declaration.

SAP Parameters

You need dedicated classes describing the interface of the RFC and the parameters. When calling for example the RFC_SYSTEM_INFO function, we need a set of export (output) parameters defined as properties on a dedicated class Export.

To specify the type mapping (see also SAP - ABAP Types Mappings), each property needs to have the stereotypes SAPIDocAttribute and XMLElement, that can have the following stereotype attributes:

Attribute	Description	Mandatory
nativeType	Specify the native ABAP type. For allowed types and valid internal/native type combinations see appendix beneath.	mandatory
internalLength	Specify the parameter length as given in the ABAP dictionary (except for FLT, INT, DATS, TIMS).	mandatory
decimals	Specify the number of decimals if there are any.	mandatory for native type `DEC`

In any case, the upper multiplicity of the properties or associations must NOT be greater than one. Otherwise, the classes cannot be mapped to SAP parameters and SAP tables should be used instead.

So, for the RFC_SYSTEM_INFO example, the structure would look like the following:

					Stereotype	Stereotype Attributes
SAP
	Interfaces
		RFCPort_RFC_SYSTEM_INFO			SAPRFCModuleInterface
			RFC_SYSTEM_INFO		SOAPRPCOperation
				out export : Export
	Types
		Export			SAPParameters
			CURRENT_RESOURCES : Integer
			MAXIMAL_RESOURCES : Integer
			RECOMMENDED_DELAY : Integer
			RFCSI_EXPORT : RFCSI
		RFCSI			SAPStructure
			RFCCHARTYPE : String		SAPIDocAttribute	nativeType = CHAR internalLenght = 4
			RFCCHARTYPE : String		XMLElement	order = 2
			RFCDATABS : String		SAPIDocAttribute	nativeType = CHAR internalLenght = 8
			RFCDATABS : String		XMLElement	order = 8
		...	...		...

The listed order attribute of the property derives from the order in the SAP data structure RFCSI.

The SAP types yet supported are listed on Native SAP - ABAP - xUML Base Type Mappings. Each SAP native type is mapped to an xUML base type. Because SAP types are sometimes restricted in their length and number of decimals, use stereotype attributes to transport this meta information as shown ion the table above.
For details on the native type definitions, refer to the SAP documentation.

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Related Pages:

Native SAP - ABAP - xUML Base Type Mappings

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Description of the SAP Interface

SAP Parameters