INVALID_PERSISTENCE

[MICHSTEP]

About 5 hours before a football match was due to start I submitted two bets, both of which were matched. At kick off time I submitted another bet LAY-IP via excel. The bet apparently was refused. On the BA interface it says "Error placing bet OK" On the excel sheet in the Bet ref cell it says "INVALID_PERSISTANCE". Can anybody explain this one, please?

[GaryRussell]

Betfair only accept keep bets before a market goes in play so you cannot use -IP when the market is in play which is why you received an error message.

[Captain Sensible]

Gary I've had the same problems submitting bets into the markets with either SP or IP being set in my triggers. Could you recode BA so it'd change persistance to None if the marketprices delay was greater than 0

[MICHSTEP]

Gary, thanks for your reply.
Since I normally submit bets on events going in play shortly before the start, I presume a fix for my problem would be to check the contents of the "In Play" / "Not in Play" cell and code the trigger cell "LAY" or "LAY-IP" accordingly?