@sethuanand2626
It seems in reporting you cannot traverse from a document version to parent objects beyond the document:
The hierarchy is
Say you have project field "customProjectField"
You'll need to create a calculated field at the document, and make it show the project custom field:
docuCustomField = {project}.{DE:customProjectField}
Then in your report you can create a column
valuefield=document:docuCustomField
valueformat=HTML
displayname=Field showing projectCustomField
linkedname=direct
namekey=document:docuCustomField