Thanks a lot. That worked immediately. What I realised from the log is that the fields and the issue comes from an old plug in called MSRP Display. It seems from 1.5.6 the functionality was transfer in the core software of Zen cart and I did not need to install it. The fields were imported in 1.5.6 from 1.5.5 (mysql 5.6) and created no issue. If I am correct the fields related to the MSRP(as mentioned in the log/installation code of MSRP) can be deleted without causing an issue? If the fields are not needed and stay there they may cause an issue in future updates. Please advise.
Thanks again.
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