Add the tables parameter to feedback the error

There is no problem using the following code

c, _ := gorfc.ConnectionFromParams(abapSystem())
    /**var t *testing.T**/

    in_date1, _ := time.Parse("20060102", "20190101")
    in_date2, _ := time.Parse("20060102", "20190701")
    params := map[string]interface{}{
        "I_FDATE": in_date1,
        "I_TDATE": in_date2,
        "I_RFC": "RFC",
    }

but add the tables parameter to feedback the error

c, _ := gorfc.ConnectionFromParams(abapSystem())
    /**var t *testing.T**/

    in_date1, _ := time.Parse("20060102", "20190101")
    in_date2, _ := time.Parse("20060102", "20190701")
    params := map[string]interface{}{
        "I_FDATE": in_date1,
        "I_TDATE": in_date2,
        "I_RFC": "RFC",
        "T_BUKRS": map[string]interface{}{
            "BUKRS": "1270",
        },  
    }

error info:

[root@localhost example]# go run hello_gorfc.go panic: reflect: call of reflect.Value.Index on map Value

goroutine 1 [running]:
reflect.Value.Index(0x4c65a0, 0xc420068180, 0x15, 0x0, 0x15, 0xc42009a300, 0x0)
    /usr/local/go/src/reflect/value.go:894 +0x1a8
github.com/sap/gorfc/gorfc.fillTable(0xe221d0, 0xe1c740, 0x4c65a0, 0xc420068180, 0x0, 0xe16a10)
    /root/Code/go/src/github.com/sap/gorfc/gorfc/gorfc.go:245 +0x18e
github.com/sap/gorfc/gorfc.fillVariable(0x5, 0xe16610, 0xc42008e420, 0x4c65a0, 0xc420068180, 0xe221d0, 0x0, 0x0)
    /root/Code/go/src/github.com/sap/gorfc/gorfc/gorfc.go:152 +0x769
github.com/sap/gorfc/gorfc.fillFunctionParameter(0xe15a90, 0xe16610, 0x4e065b, 0x7, 0x4c65a0, 0xc420068180, 0x0, 0x0)
    /root/Code/go/src/github.com/sap/gorfc/gorfc/gorfc.go:126 +0x297
github.com/sap/gorfc/gorfc.(*Connection).Call(0xc420068150, 0x4e3516, 0x19, 0x4c65a0, 0xc4200681b0, 0x0, 0x0, 0x0)
    /root/Code/go/src/github.com/sap/gorfc/gorfc/gorfc.go:1073 +0x3b6
main.main()
    /root/Code/go/src/github.com/sap/gorfc/example/hello_gorfc.go:40 +0x46c
exit status 2

BUKRS type is char

Ask everybody elder brother to help have a look. tks...

SAP / gorfc

Add the tables parameter to feedback the error #17