What does the error "RMS:Lt rate not found for rule: Check price based on LTP for Buy and Sell Orders for entity account-[ID]across exchange across segment across product" mean?

RMS:Lt rate not found for rule: Check price based on LTP for Buy and Sell Orders for entity account-[ID]across exchange across segment across product

This error occurs when a particular scrip has been moved from one series to another, & an order is placed in the older series.

For Ex:

Apex Frozen Foods was moved from BE series to EQ - & is currently trading as a stock in the EQ series.

If a user places an order in APEX-BE from the trading terminal, the order will get rejected & the above error will be displayed. This can be resolved by placing the order in the current series under which the stock is trading, which in this example would be APEX-EQ which is shown as just APEX in the market watch.