ASTM Name from Atterberg Only

I want to get the ASTM soil description name based on Atterberg Limits only.  I'm not sure how to modify the ASTM_Name function to get this. 

This code gives me the ASTM Group Name when I have both SIEVE and ATTERBERG results:

<<ASTM_Name(<<SV READINGS.Reading>><<#>>,<<SV READINGS.Percent_Finer>>,_
                       <<ATTERBERG.Plastic_Limit>>,<<ATTERBERG.Liquid_Limit>>,_
                       <<ATTERBERG.Organic>>)>>

This code gives me the ASTM Group Name for soils that are visually-manually estimated to be nonplastic, where we have SIEVE but no ATTERBERG:

<<ASTM_Name(<<SV READINGS.Reading>><<#>>,<<SV READINGS.Percent_Finer>>,0,0,0)>>

What I need is the code that will give me ASTM Group Name for a soil that is visually-manually estimated to have less than 15% coarse grained soil (size larger than 0.075mm) where we have ATTERBERG but no SIEVE

Thank you.