Gift Horse - error on winning trade

[Joe68]

Please help - any suggestions welcome.

What should have been a winning trade was blocked by an error;

"EXPOSURE_OR_AVAILABLE_BALANCE_EXCEEDED"

when my bot was trying to place Back bets totalling $0.16 on an account of $16.80. Small bananas I know. This is proof of concept work and whether or not this profit were taken affects whether or not the concept is proven.

Answers to probable suggestions;
Yes, absolutely sure on the total the system was trying to back - hard coded.
Yes, absolutely sure on the account total - have a history indicating that that was the total at the time
Yes, absolutely sure that the account total was in the correct wallet
Exposure on previous race was $0

Further details;
The system was running unmonitored without my input
Similar sized back bets successfully placed by system on 14 other races
There was a similar error on the previous race - so error occurred in 2 races out of 16
Exposure on race prior to first error was $0.08
Iterating through the Quick Pick list from Excel - iteration successful on all available evidence
Bets placed from Excel
Bets placed InPlay at jump

Can't figure it out - requested exposure was nowhere near the limit so far as I can see - by design. Suspect a bug somewhere - BA or BF, perhaps associated with new API. Have debugged here and found nowt.

[Dai_Young]

Assuming that you were trying to back multiple runners -- your exposure would have been much higher than $0.16 because of the way betfair/BA processes bets below minimum stakes.

Not sure exactly what currency you are using but lets say the minimum stake is $2. Suppose you were trying to back 10 runners simultaneously . In order to process that BA would first fire 10 bets of $2. $20 is higher than $16.80 therefore you'd get the error message.

[Joe68]

Fantastic. Thanks a bunch. That fits exactly - error arises when too many back bets placed simultaneously with sub-minimum amounts.

>3 bets produced error. As you say, because of the way sub-minimum bets are executed.

Easy to fix - just fund the account some more.

[Joe68]

Or change batch size for below minimum stake bets, I see now.

[rourkem]

I'll opt for changing the batch size. Thanks for posting it too.