Error with PROCESS_ECO API when trying to include substitute components in the API

Hello All,

I am able to create ECOs just with the revised items and components items but when I include the substitute components record type as well, it throws me the below error which doesn't make much sense. Any help would be highly appreciated. Below is the snippet of record type that I am adding to create substitute components and also the error that I am getting

lv_sub_component_tbl(lv_sub_comp_cnt).eco_name                      :=  lv_eco_rec.eco_name;

lv_sub_component_tbl(lv_sub_comp_cnt).organization_code             :=  lv_org_code;

lv_sub_component_tbl(lv_sub_comp_cnt).revised_item_name             :=  cur_inv_comp_rec.assembly_item_number;