protected virtual void LoadData(DocumentIDGroup documentIDGroup, int?branchID, string taxPeriodID)
{
var refNbrs = documentIDGroup.RefNbrs.ToArray();
TaxTransByRefNbr = GafRepository.GetTaxTransForDocuments(documentIDGroup.Module, documentIDGroup.DocumentTypes.ToArray(), refNbrs, taxPeriodID)
.GroupBy(taxTran => taxTran.RefNbr)
.ToDictionary(group => group.Key, group => group.ToList());
var usedTaxIDs = TaxTransByRefNbr.Values.SelectMany(taxTranList => taxTranList.Select(taxTran => taxTran.TaxID))
.Distinct()
.ToArray();
Taxes = GafRepository.GetTaxesByIDs(usedTaxIDs)
.ToDictionary(tax => tax.TaxID, tax => tax);
}