DDS Box keyword with shade parm v6r1

I'm trying to confirm the doc DDS for Printer Files V6R1
page 33 is not an avail feature.
In the source editing it tells me the keyword invalid.
If I accept with errors, the compiler fails to gen the PRTF.
Page 34 has example
A      R     BOX4  BOX(1.2  0.5  5.1  6.3  0.2 (*SHADE 50))

I remember early in 6.1 someone mentioned this made the manual but was not
implemented.

In truth I really need shading sometimes in a box, sometimes not in a box but
behind a line of text (like alt row color in html). A page segment or overlay is
kludgy because need same location control as a box. The area of the page this
appears is variable in location & nbr lines.


Jim Franz