DevOps, CI/CD and Automation

Hopefully, I'm posting this in the correct forum. I'm also posting on an Access forum as I'm not entirely sure where the issue lies.

I'm calling an Oracle function from Access 2007 using an ADO Command object.

The function takes three input parameters and has a return value and an output parameter. The output parameter is a BLOB, and the return value is varchar2 (either "T" or "N") based on the outcome of the function.

If I pass correct values to the function, I get the following error message (errs out on the command.execute line):

Run-time error '-2147467259 (80004005)':
[Oracle][ODBC][Ora]ORA-06502: PL/SQL: numeric or value error
ORA-06512: at line 1

Here's the function:

FUNCTION GET_ITEMREV_ATTACH(P_ORGANIZATION_ID IN NUMBER,
P_INVENTORY_ITEM_ID IN NUMBER,
P_REVISION IN VARCHAR2,
X_DRAWING OUT BLOB) RETURN VARCHAR2 IS
RESULT VARCHAR2(1);
BEGIN
RESULT := 'T';
BEGIN
SELECT L.FILE_DATA
INTO X_DRAWING
FROM FND_ATTACHED_DOCUMENTS AD,
MTL_ITEM_REVISIONS_B IR,
FND_DOCUMENTS_TL D,
FND_LOBS L
WHERE AD.ENTITY_NAME = 'MTL_ITEM_REVISIONS' AND
AD.PK1_VALUE = IR.ORGANIZATION_ID AND
AD.PK2_VALUE = IR.INVENTORY_ITEM_ID AND
AD.PK3_VALUE = IR.REVISION_ID AND
AD.CATEGORY_ID = 1001216 AND
D.DOCUMENT_ID = AD.DOCUMENT_ID AND
D.LANGUAGE = 'US' AND
L.FILE_ID = D.MEDIA_ID AND
IR.ORGANIZATION_ID = P_ORGANIZATION_ID AND
IR.INVENTORY_ITEM_ID = P_INVENTORY_ITEM_ID AND
IR.REVISION = P_REVISION;
EXCEPTION
WHEN OTHERS THEN
RESULT := 'N';
END;
RETURN(RESULT);
END GET_ITEMREV_ATTACH;

Here's the VB code I'm using to call the function:

Private Sub Command8_Click()
Dim CMD As New ADODB.Command
Dim conn As ADODB.Connection
Dim Param1 As ADODB.Parameter
Dim Param2 As ADODB.Parameter
Dim Param3 As ADODB.Parameter
Dim ParamBlob As ADODB.Parameter
Dim ParamReturn As ADODB.Parameter

Set conn = New ADODB.Connection

With conn
.ConnectionString = "Driver={Oracle in OraHome92};Dbq=OAPLY;UID=***;PWD=*******"
.CursorLocation = adUseClient
.Open
End With

Set CMD = New ADODB.Command
Set CMD.ActiveConnection = conn
CMD.CommandText = "immi_attach_pub.get_itemrev_attach"
CMD.CommandType = adCmdStoredProc

Set ParamReturn = CMD.CreateParameter("RESULT", adVarChar, adParamReturnValue, 1)
CMD.Parameters.Append ParamReturn
Set Param1 = CMD.CreateParameter("P_ORGANIZATION_ID", adInteger, adParamInput, 1, 6)
CMD.Parameters.Append Param1
Set Param2 = CMD.CreateParameter("P_INVENTORY_ITEM_ID", adInteger, adParamInput, 4, 5207)
CMD.Parameters.Append Param2
Set Param3 = CMD.CreateParameter("P_REVISION", adVarChar, adParamInput, 2, "04")
CMD.Parameters.Append Param3
Set ParamBlob = CMD.CreateParameter("X_DRAWING", adLongVarBinary, adParamOutput, 200000)
CMD.Parameters.Append ParamBlob

CMD.Execute , , adExecuteNoRecords *** this is where the error occurs
conn.Close
MsgBox CMD.Parameters("RESULT")

End Sub

I've tried using different data types for the varchar2 parameters (adVarChar, adBSTR, adChar) with no difference.

If I pass a bogus value for Param3...."'04'"...the function returns "N" indicating that it actually executed something. But, when I pass the correct value "04", it returns the above mentioned error.

I can execute the function in PL/SQL just fine, so I'm thinking there's something wrong with the parameters, datatype, or other definitions on the Access side.

Does anyone have any thoughts? I'm at a dead end with this. Sorry for the long post. Thank you.