Problem with the formulae

Hallo,

I have the following crystal report formulae, which gives me a blank output results when "ALL" is selected at runtime. I want to display all the climcomps shown below if the option "ALL" is selected. Please could anyone tell me where the problem i.. Thanks

Code:

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(if {?By System Version} = "ALL" then TRUE
    else {DistinctGP27.CLINCOMP} = {?By System Version}) and
{DistinctGP27.CLINCOMP} ="In Vision" and
{DistinctGP27.CLINCOMP} ="INPS London (Vision)" and
{DistinctGP27.CLINCOMP} ="INPS Vision" and
{DistinctGP27.CLINCOMP} ="IPS" and
{DistinctGP27.CLINCOMP} ="IPS In Vision 3" and
{DistinctGP27.CLINCOMP} ="IPS Reuters Surgery Mgr" and
{DistinctGP27.CLINCOMP} ="IPS Reuters Vamp" and
{DistinctGP27.CLINCOMP} ="IPS Reuters Vision" and
{DistinctGP27.CLINCOMP} ="IPS Reuters Vision 2.1" and
{DistinctGP27.CLINCOMP} ="IPS Vision" and
{DistinctGP27.CLINCOMP} ="IPS Vision 3" and
{DistinctGP27.CLINCOMP} ="ips viso" and
{DistinctGP27.CLINCOMP} ="Vamp Vision" and
{DistinctGP27.CLINCOMP} ="Vamp Vision (INPS)" and
{DistinctGP27.CLINCOMP} ="Vamp Vision INPS" and
{DistinctGP27.CLINCOMP} ="Vision" and
{DistinctGP27.CLINCOMP} ="Vision 3" and
{DistinctGP27.CLINCOMP} ="Vision in Practice"

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Try the next

Code:

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({?By System Version} = "ALL") OR
({DistinctGP27.CLINCOMP} = {?By System Version} AND {?By System Version}<>"ALL")

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Fill your parameter array with all the system versions, of course