bulk update financial dimension using excel

Hi All,

My requirement is to update the financial dimensions of the project and subprojects. I have a excel file which will be having the financial dimensions values(empty values also) for department, division, cost center, program.

I've written code to update the dimensions by reading the excel. When a field in excel is read which is having empty(department) value I'm getting error as "Unable to return DimensionAttributeValue record for".

Please let me know how can i update the dimension fields when I have value as empty and when values are present.

Thanks.