"Serial No / Batch No are mandatory for Item"

While submitting a Landed Cost Voucher for a Purchase Receipt, we receive the “Serial No / Batch No are mandatory for Item” error.
That is due to the new Serial No / Batch No implementation. That is crtitcally important for the Period Closing and Accounting. It is also not possible to delete the Purchase Receipt to redo the transaction. This issues the same error.
This is highly critical. Any ideas? We run version-15 of Erpnext