Status DLV/TECO was reversed after settlement of period & &

What causes this issue?

Either the sender is a production order or an internal order without
revenues (or WBS element). This sender contains a results analysis key
and you need to treat it as a WIP element.
The sender is a production order.
You either delivered or technically completed the production order
during period &v1& &v2&, and then you settled it. You settled actual
costs to Material or to a price difference account. Where necessary,
you settled variances to Profitability Analysis.
During the current settlement period &v3& &v4&, the production order
is neither delivered, nor technically completed. This means that you do
not have to settle any actual costs.
The sender is a WIP element.
The internal order (or WBS element) was technically closed during the
period &v1& &v2&. It was also settled in this period. During
settlement the actual costs were settled to the receiver of the
settlement rule andthe WIP was broken down.
However, during the current settlement period &v3& &v4&, the internal
order (or WBS element) is not technically completed. This means that
you cannot settle any actual costs.

How to fix this error?

If you wish to settle actual costs and variances in this period too,
then you need to make the corresponding settings as mentioned above.
This enables the system to continue settlement of actual costs and of
variances.
Otherwise, you need to reverse the settlement of actual costs or
variances in period &v1& &v2&. This enables the transfer of work in
process to Financial Accounting, should the sender contain a results
analysis key.
Note, you can only reverse a settlement correctly if the current
quantity stored in Material corresponds to the quantity stored at the
time of settlement.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Example 1:
Period 1 : Order delivers 10 pieces to warehouse
Quantity stored: 10 pieces
Period 2 : Order settlement for period 1 / Base quantity: 10 pieces
Order delivery is reversed at a later date
Quantity stored: 0 pieces
Procedure in this case:
1. Repeat delivery -> Quantity stored: 10 pieces
2. Reverse settlement
3. Repeat delivery reversal -> Quantity stored: 0 pieces
Example 2:
Period 1 : Order delivers 10 pieces to warehouse
Quantity stored: 20 pieces
Period 2 : Order settlement for period 1 / Base quantity: 10 pieces
Order delivery is reversed
Quantity stored: 10 pieces
Procedure in this case:
Settlement reversal is sufficient, since the quantity stored >= the
base quantity of the order.

Error message extract from SAP system. Copyright SAP SE.