Error while downloading a hierarchy to a flat file

Hi,

I create manually a time dependent hierarchy for 0HRPOSITION. When I try to download this hierarchy to a flat file using the program Z_SAP_HIERARCHY_DOWNLOAD I get a dump with the following error:

"The call to function module "RSNDI_SHIE_STRUCTURE_GET" is incorrect:

In the function module interface, it was stipulated that only fields of a specific type and length can be specified under "E_T_HIERINTVL". The

currently specified field )" ") has the right type, but its length is incorrect."

I''ve been looking through forums and can't get any help. Can somebody help me? I will greatly appreciate it.