Hi ,
First check at ECC Side RSA3 and check which currency is coming there.
for same record check at PSA and see the currency value. if its shows the different currencies then you need to update values of unit(which referenced your WAERK).
if you maintained master data for unit, you can reload and run ACR.
Other wise do the transfer global settings and update data to Unit.
Later you can check, the values. if its shows same then do the selective deletion and reload.
After that check the values.
Thanks