Hi,
First I want to thank you personally for sharing this awesome library.
I came across this issue yesterday.
Suppose you have a function module (Z_Function) in SAP that takes parameter "I_RANGE" which is based on this structure Z_Erdat.
The structure has these fields:
SIGN -> char -> length 1
Option -> char -> length 2
Low -> ERDAT -> DATS (date with 8 character length)
HIGHT -> ERDAT-> DATS (date with 8 character length)
I want to create this range table based on Z_Erdat and send it to Z_Function as parameter I_RANGE.
Following your code I created this:

` public class I_RANGE
{
public Z_Erdat erdat { get; set; }

}

public class Z_Erdat
{
    [RfcEntityProperty("SIGN", SapDataType = RfcDataTypes.CHAR, Length = 1)]
    public string Sign { get; set; }

    [RfcEntityProperty("OPTION", SapDataType = RfcDataTypes.CHAR, Length = 2)]
    public string Option { get; set; }

    [RfcEntityProperty("LOW", SapDataType = RfcDataTypes.DATE_8)]
    public DateTime Low { get; set; }

    [RfcEntityProperty("HIGH", SapDataType = RfcDataTypes.DATE_8)]
    public DateTime High { get; set; }
}

public class Z_FunctionInputParameter : IRfcInput
{
    [RfcEntityProperty("I_RANGE")]
    public I_RANGE range { get; set; }

}`

Based on these when I try to run ExecuteRFCAsync like below:

var result = await client.ExecuteRfcAsync<Z_FunctionInputParameter , Z_FunctionOutputParameter>("Z_Function", inputParameter);

I get the following error:
RfcException: SAP RFC Error: RFC_CONVERSION_FAILURE with message: I_Range of type RFCTYPE_TABLE cannot be converted to type RFC_STRUCTURE_HANDLE

In a nutshell, I want to pass the I_Range parameter which is based on a range structure Z_Erdat to function module Z_Function.
I appreciate your help.