Cash flow generation unsuccessful; transaction & ; &

What causes this issue?

No cash flow could be generated for the financial transaction.

System Response

The transaction is marked as containing an error.

How to fix this error?

Check that all the information required for generating a cash flow is
available. In particular, master data plus a condition header with one
or more condition items is required.
Note the following points:
The beginning of the fixed interest period is required.
(-> condition header)
The interest calculation method is required.
(-> condition header)
The end of the fixed interest period should be given. If this is not
the case, the end of the term must be known.
(-> condition header)
A flow type has to be set up properly in Customizing for the
disbursements.
A flow type must be set up in Customizing for the residual amount
(Residual = disbursements - repayments).
The IS-B cash flow has to contain at least two flows. (Make certain
that the desired flow types are marked as relevant for calculation in
Customizing.)
No cash flows may exist before the commitment date (or the beginning of
the fixed interest rate period).
For variable loans, there must be an existing yield curve for
calculating forward rates for the given reference interest rates (->
Customizing). The Customizing settings for this yield curve must
specifically allow for the calculation of forward rates. The values for
the yield curves for the date relevant for determining forward rates
must be maintained.
For variable loans, an interest rate adjustment 'relative to each
reference interest entry' cannot be supported because the future
adjustment dates are not known. Therefore no appropriate forward rates
can be calculated.
In the event of a settlement costing run, the simulated disbursements
cannot fall outside the fixed interest rate period.

Error message extract from SAP system. Copyright SAP SE.