This issue can occur due to one or more of the following reasons:

• The Indent is marked as Debit-able, but the Purchase Order is not marked as Debit-able.
  Ensure both are aligned.
• The Material Role Mapping has not been done for the material in the indent.
  Verify that the mapping is completed.
• The Indent may not be approved yet. Only approved indents are available for selection
  during Purchase Order creation.

Make sure all these conditions are met to view the indent details in the Purchase Order screen.