Please make sure whether data is actually present in your designated location.

When index is designated, data is obtained from the designated index location within the same element names. For example if element name column 6 is set from the mapper entry schema, despite it mapping out correctly the data will fail to obtain data and outputs null if there’s only three columns for element name.

For any element names that are not designated with index entry schema, there is a chance that data may be obtained from a different same-named element name. In such situation please specify the index to avoid this issue.