Error en subconsulta que sale vacio " " en su mess

[Saidoc]

Hola, tengo un procedimiento almacenado en hana el cual ejecuta perfectamente desde HANA STUDIO, pero al hacer el llamado desde mi proyecto C# Visual Studio 2022 sale este error => “”

, he detectado que el problema viene de la subconsulta y pareciera que se debe al largo de caracteres o alguna sintaxis mal puesta. Ya que si elimino la subconsulta si llama los datos desde mi aplicativo, por favor alguna idea para solucionar este inconveniente.

Este es el procedimiento:

create PROCEDURE REG_ENTRADA_MERCANCIA_MOD (DocNum INT default 0,
	 DocDate NVARCHAR(10) default null,
	 ItemCode NVARCHAR(100) default null,
	 BatchNum NVARCHAR(36) default null,
	 CardCode NVARCHAR(100) default null,
	 Almacen NVARCHAR(8) default null,
	 RefFactura NVARCHAR(30) default null
	 ) LANGUAGE SQLSCRIPT AS 
BEGIN SELECT
	 DISTINCT T4."DocNum",
	 TO_CHAR(T4."DocDate",
	'YYYY-MM-DD'),
	 T4."CardCode",
	 T4."CardName",
	 T4."Address",
	 T3."WhsCode",
	 T5."FirmCode",
	 (SELECT
	 "FirmName" 
	FROM "B1H_COBEFAR_2018".OMRC 
	WHERE "FirmCode" = T5."FirmCode") ,
	 T3."ItemCode" ,
	 T3."Dscription",
	 T3."Quantity",
	 T5."NumInBuy",
	 T5."BuyUnitMsr",
	 T2."DistNumber" ,
	 TO_CHAR(T2."ExpDate",
	'YYYY-MM-DD') 
	 ,T4."U_SYP_MDTO"||'-'||T4."U_SYP_MDSO"||'-'||T4."U_SYP_MDCO"
	,(SELECT MAX(distinct x2."NumAtCard") 
		from opdn x 
		inner join pdn1 x1 on x1."DocEntry"=x."DocEntry" 
		and x1."ItemCode" = T1."ItemCode" 
		inner join pch1 x0 on ((x0."BaseEntry"= x1."DocEntry" 
				and x0."BaseType"=x1."ObjType" 
				AND x0."BaseLine" = x1."LineNum") 
			or (x0."DocEntry"= x1."BaseEntry" 
				and x0."ObjType"=x1."BaseType" 
				AND x0."LineNum" = x1."BaseLine")) 
		and x0."ItemCode" = x1."ItemCode" 
		inner join opch x2 on x2."DocEntry" = x0."DocEntry" 
		where x."DocEntry" =T1."DocEntry"
		and x."CANCELED"='N' 
		and x."U_SYP_STATUS"='V' 
		AND x2."NumAtCard" NOT LIKE 'AC%' 
		--and x."DocEntry"=DocEntryOPDN
		and x2."CardCode"=T4."CardCode")
FROM "B1H_COBEFAR_2018".ITL1 T0 
INNER JOIN "B1H_COBEFAR_2018".OITL T1 ON T0."LogEntry" = T1."LogEntry" 
INNER JOIN "B1H_COBEFAR_2018".OBTN T2 ON T0."ItemCode" = T2."ItemCode" 
and T0."SysNumber" = T2."SysNumber" 
INNER JOIN "B1H_COBEFAR_2018".PDN1 T3 ON T1."DocEntry" = T3."DocEntry" 
INNER JOIN "B1H_COBEFAR_2018".OPDN T4 ON T3."DocEntry" = T4."DocEntry" 
INNER JOIN "B1H_COBEFAR_2018".OITM T5 ON T5."ItemCode" = T3."ItemCode" 
WHERE T4."CANCELED" ='N' 
and T1."ApplyLine"=T3."LineNum" 
and T3."ItemCode" = T2."ItemCode" 
and ((DocNum <>0
		and T4."DocNum" =DocNum) 
	or DocNum =0) 
and ((DocDate is not null 
		and T4."DocDate" =DocDate) 
	or DocDate is null) 
and ((ItemCode is not null 
		and T3."ItemCode" =ItemCode) 
	or ItemCode is null) 
and ((BatchNum is not null 
		and T2."DistNumber" =BatchNum) 
	or BatchNum is null) 
	and ((CardCode is not null 
		and T4."CardCode" =CardCode) 
	or CardCode is null) 
	and ((Almacen is not null 
		and T3."WhsCode" =Almacen) 
	or Almacen is null) 
	and ((RefFactura is not null 
		and   T4."U_SYP_MDTO"||'-'||T4."U_SYP_MDSO"||'-'||T4."U_SYP_MDCO" =RefFactura) 
	or RefFactura is null) 
order by TO_CHAR(T4."DocDate",
	'YYYY-MM-DD') desc ,
	T4."DocNum" desc ;
END ;

[meqs]

@Saidoc , por favor, recuerda formatear el código sql adecuadamente y pasar por la sección Presentaciones