Creating function description: "inconsistence in description detected ..."

In my own NW RFC-SDK based application, I am trying to create a RFC module description the hard way, which is to not download such a description from a SAP system, but to craft the description on-the-fly using API functions RfcCreateFunctionDesc, RfcCreateTypeDesc, RfcAddTypeField, RfcAddParameter and RfcCreateFunction. When calling RfcCreateFunction the system responds with the message
"inconsistence in description detected: non-unicode length is too small".
As far as I can tell all values I provided in the API arguments are correct, including the unicode and non-unicode lengths in the type description of a structure that is underlying the only RFC parameter in the module.
Here is what the module isi supposed to look like:
module has only one Export parameter
the parameter is structured
the structure has a single field only, which is a character array of length 64 (i.e 128 bytes).
My application is unicode based. I added some code to the application to trace the API calls along with the argument values. Here is the output:
API RfcCreateFunctionDesc
Created function description object; returned handle: 024A1880
API RfcCreateTypeDesc
Created type description object; returned handle:     024A1A00
API RfcAddTypeField
Added Field to type description 024A1A00:
name                DEST
type                0
nucLength           64
nucOffset           0
ucLength            128
ucOffset            0
decimals            0
typeDescHandle      00000000
extendedDescription 00000000
API RfcAddParameter
Added parameter to funtion description 024A1880:
name                ATTRIBUTES
type                17
nucLength           64
ucLength            128
decimals            0
typeDescHandle      024A1A00
optional            0
direction           2
parameterText
defaultValue
extendedDescription 00000000
API RfcCreateFunction
Created function object from description 024A1880; returned handle:     00000000
RFC_INVALID_PARAMETER inconsistence in description detected: non-unicode length
is too small
Thanks so much for any help!

Case closed. There was an API call missing in my code, RfcSetTypeLength, which sets the total lengths (unicode and non-unicode) of the structure after adding the structure components.Without that call the system assumes those lengths to be zero, thus the error ...

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Message was edited by:
nazeer shaik

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