Error - function cannot be executed

What causes this issue?

You want to create new capital investment program positions. A
handling error has occurred.

System Response

The function cannot be carried out.

How to fix this error?

Follow this procedure when creating new positions:
Position the cursor on the position, at which or below which you
want to create new positions.
Use the function <PF>Create</>.
Enter the new positions.

Error message extract from SAP system. Copyright SAP SE.