INSERT substring,string,start[,length]
substring is inserted in string starting from start. If length is specified, overrides predefined length of substring and so must be <= of this predefined length.
Param. Name Mode Type coding Remark 1 substring Input String C or X String to insert; max length 255 char. 2 string Input/Output String C or X String to do insertion; max length 255 char. 3 start Input Integer F or H or const. Start inside 2nd parameter; first character has position 1 4 length Input Integer F or H or const. If omitted, insertion is up to end of 1st string
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