[amibroker] Why? the volume of the first bar in interaday time-fram (15 min) is negative

["masspectrometry" <yangwangyw@xxxxxxxxxxx>]

I find  the volume of the first bar ( in the current day) in interaday time-
fram (for example, 15 min. chart) is negative for all tickers. Therefore, I 
get the wrong interaday's volume value. How is it and how to correct it





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