Language Reference Guide : 4. System Classes : FormField Class : ReadBias Attribute
 
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ReadBias Attribute
Data Type: smallint
4GL Access: RW
The ReadBias attribute specifies the bias setting for a field when the CurMode attribute for the frame is set to FM_READ.
If you set this attribute at a time when the CurMode is something other than FM_READ, it is not enforced until the CurMode setting is changed to FM_READ. If you set the CurBias attribute when the CurMode is FM_READ, this attribute is changed. If the field is a composite field, setting this attribute affects the children as well (see CurBias Attribute for details).
The valid settings are the same as for CurBias Attribute.