I cannot able to sort it out I am passing id that but id is not having degree certificate document but still the document download link is showing for all other documents

Your query is not clear . what i understand is , are you trying to show and hide document link on the basis of a column id. could you please also put your code here. to identify the issue 

Are you saying the id what you are holding is not the correct document Id . the document id is not available or not holding the degree document in it .

is the document name upload a common name or it can be any random name

a!localVariables(

/*local!data:rule!GHR_GetPersonalDetails(resourceId:ri!rid ),*/
local!document:{
aadhaarPic:46
},
/*local!education:rule!GHR_GET_EDUCATION_DETAILS_QE(resourceId: ri!rid),*/
/*local!account:rule!GHR_GET_ACCOUNT_DETAILS_QE(rid: ri!rid),*/
/* The selected navigation section */
local!activeLightweightNavSection: 1,
/* The navigation sections */
local!lightweightNavSections: {
"Address",
"Qualification",
"Previous Employment",
"Accounts & Statutory",
"Photo",
"Resume",
"Bank Statements",
"LOA",
"Education"
},
a!columnsLayout(
columns: {
a!columnLayout(
contents: {

a!richTextDisplayField(
value: {

a!richTextItem(
text: "Present Address",

link: a!documentDownloadLink(
document:index(local!document,"aadhaarPic",null)

)

),
a!richTextItem(
text: " "
),
a!richTextIcon(
icon:"download",
showWhen: if(a!isNotNullOrEmpty(index(local!document,"aadhaarPic",{})),true(),"Not uploaded")
)
},

showWhen: and(
if(
a!isNotNullOrEmpty(index(local!document, "aadhaarPic", {})),
true(),
false()
),
if(
document(todocument(index(local!document, "aadhaarPic", {})),"name")<>"Adhar card",
false(),
true()
),
if(
a!isNotNullOrEmpty(local!document),
true(),
false()
)
)
),

a!richTextDisplayField(
value: {
a!richTextItem(
text: "Permanent Address",
link: a!documentDownloadLink(
document:index(local!document,"panPic",null)

),
showWhen: if(a!isNotNullOrEmpty(index(local!document,"panPic",{})),true(),false())
),
a!richTextItem(
text: " "
),
a!richTextIcon(
icon:"download",
showWhen: if(a!isNotNullOrEmpty(index(local!document,"panPic",{})),true(),false())
)

}

)

}
/*showWhen: if(a!isNullOrEmpty(local!document),true(),"Not uploaded")*/
),
a!columnLayout(
contents: {}
)
}
))

actuualy for the particular id there is no document in database it is showing null,... but the document download link is showing ,

I also kept showwhen conditions 

could you please provide the data you have for the display purpose . I would like to see the data structure for more clarification . Please print the data in the UI using a textfield() and see what actually you are receiving and also share so that i can try with same data in your UI code