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According to the macro documentation for PARMBUFF if a macro definition
includes both a set of parameters and the PARMBUFF option, the macro
invocation should cause the parameters to receive values and cause the
entire invocation list of values to be assigned to SYSPBUFF. It does
assign the entire list to SYSPBUFF, but if you have keyword parameters
defined they do not get assigned values.

Example:
%macro test(b=) / parmbuff;
 %put &syspbuff;
 %put *&b*;
%mend;
%test(1 2 3 4 5,b=100)

Incorrect results:
MLOGIC(TEST):  %PUT &syspbuff
(1 2 3 4 5,b=100)
MLOGIC(TEST):  %PUT *&b*
**

Correct results:
MLOGIC(TEST):  %PUT &syspbuff
(1 2 3 4 5,b=100)
MLOGIC(TEST):  %PUT *&b*
*100*

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