I have qvd file with fields:
Revenue with VAT price
Revenue w/o VAT price
Net revenue price
Net net revenue price
These fields agregated by PricesKey and YearMonth.
For some YearMonth values (Revenue with VAT price,Revenue w/o VAT price,Net revenue price,Net net revenue price) is null.
In these cases i need get values from nearest previous YearMonths.
Many thanks for help.