Picked quantity is larger than the quantity to be delivered

What causes this issue?

The picking quantity you entered is larger than the amount to be
delivered, which is not allowed. Please note that if materials are
handled in batches the batch items must be picked. If there is a batch
split, the delivery quantity of the main item is equal to zero.

How to fix this error?

Change the picking quantity to a value less than or equal to the
delivery quantity or increase the delivery quantity before you enter the
picking quantity.
To pick batch split items, select <LS>+</>
for the main item in the <LS>Batch split indicator</> column in the
item overview. The system then displays the item's batch structure.
IF &[SWITCH]SFSW_FASHION&='X'.
You cannot change the delivery quantity for the materials relevant for
order allocation run. Hence, change the picking quantity according to
the delivery quantity.
ENDIF.

Error message extract from SAP system. Copyright SAP SE.