Symptoms

1. When attempting to test SAP destination connection, errors with:
Connection test failed. RfcOpenConnection failed: Parameter ASHOST, GWHOST, or MSHOST is missing. (RFC_INVALID_PARAMETER)

2. When attempting to expand SAP destination in Visual Studio >
Cannot call NetWeaver RFC API. See help for details. Please install ERPConnectNW35_x86.dll to GAC and put recent 32-bit versions of the NetWeaver RFC libraries in your SysWOW64 folder (typically C:WindowsSysWOW64). See SAP note 1025361. Please make sure you have installed Visual C 2005 SP 1 ATL Security Update (x86).
 

Diagnoses

1. There was an extra space after the 'ASHOST= ' parameter in the SAP destination connection string.

2. This was an x64 OS client tool machine. Testing the SAP Destination via the K2 Connection Administration tool did not error, while testing from Visual Studio > K2 Service Object Designer erred. The KB article below was used for upgrading with regard to the 'SAP Netweaver RFC Libraries':

http://help.k2.com/kb000707
 

Resolution

1. Removing the extra space resolved this error.

2. The issue was resolved after also copying the 'x32 SAP Netweaver RFC Libraries' assemblies to the 'C:WindowsSysWOW64' directory on this x64 bit OS. A documentation update request was also logged with regard to this information in the previously mentioned KB.

From the SAP site, the download link for the x32 SAP Netweaver RFC library is labeled as "Windows Server on IA32 32bit".