Cycle &1, start date &2, does not include any senders.

What causes this issue?

No senders were found for cycle &V1&, starting date &V2&.

System Response

It is no longer possible to create receivers and assign senders for the
segment.

How to fix this error?

Check the definition of the cycle in the maintenance transaction for
&V3&. No valid sender cost centers could be found to match your
selection.
If you use the sender rules "Posted amounts" or "Posted quantities",
check whether records exist in the database for the criteria you
entered (cost element, version...)
During indirect activity allocation with the sender rule "posted
quantities", you should also note that only the difference between the
planned/posted activity allocation and the scheduled activity quantity
is allocated. If you entered activity types as sender, you should at
this point also check the activity type category. For those quantities
posted with an activity type of category 1 (manual entry, manual
allocation) no indirect activity allocation is possible.
If this is an allocation in the FI/FI-SL area, the problem could also
be due to the inheritance logic for FI-SL totals tables, whose
"Inheritance of sender based on the receiver" indicator is activated in
the "Partner object update" view (T811U-INHERSRC). These are tables
that were installed before Release 4.6A.
Use transaction GCA8 to check this, and see the section on:
<DS:TX.FI_GLX_GA_INHERIT>Inheritance Logic for Allocations</>
then correct the affected cycle, if required.

Error message extract from SAP system. Copyright SAP SE.