Adding a fix for the "ImportError: cannot import name Retract". - This error arose when upgrading bika from 3.1.6 to 3.1.7 and then trying to view all the Analysis Requests.
Adding a fix for the "ImportError: cannot import name Retract".
- This error arose when upgrading bika from 3.1.6 to 3.1.7 and then trying to view all the Analysis Requests.

labsanmartin/Bika-LIMS,labsanmartin/Bika-LIMS,labsanmartin/Bika-LIMS,veroc/Bika-LIMS,rockfruit/bika.lims,veroc/Bika-LIMS,veroc/Bika-LIMS,rockfruit/bika.lims