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                                Delete a Blob                                 
function PXBlobDrop
   (RecHandle    : RecordHandle;      { record handle containing Blob field }
    FldHandle    : FieldHandle): Int; { field handle of Blob to delete      }
Errors: PXERR_TYPEMISMATCH       30  Data type mismatch
        PXERR_BLOBOPEN           52  Blob already open
        PXERR_INVFIELDHANDLE     75  Invalid field handle
        PXERR_INVRECHANDLE      104  Invalid record handle | 
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