I'm migrating from 1.7.2 to 2.1.6 with data migration tool.
All checks passed, but this erros has displayed:
...
[2017-05-11 06:14:39][INFO][mode: delta][stage: volume check][step: SalesIncrement Step]: started
100% [============================] Remaining Time: 1 sec
SQLSTATE[42S02]: Base table or view not found: 1146 Table 'magento2.sequence_rma_item_0' doesn't exist, query was:
SELECT `sequence_rma_item_0`.* FROM `sequence_rma_item_0` ORDER BY `sequence_value` DESC LIMIT 1
Please, help me 
Mário P
Brazil