Missing data fields in Query designer

Hi Guys,

A query exists on an ODS. There are few characteristics and navigational attributes in the ODS. In Query designer, on the left hand side under Dimensions,

i can see 'Data part' (for Data fields of ODS) and 'Key section' (for Key fields of ODS).

All but 2 fields (One data field and one navigational attribute of the ODS) are seen under 'Dart part' of the query designer.

Data field - Accounting Document number

Navigational attribute - Actual Acquisition Fiscal Year

What may the reason for those 2 fields not appearing.

Any help is greatly appreciated.