FAGLL03, FS10N (Layout), FBL3N Customer No not Pick

Dear All,

when my user go for GL line item level through FAGLL03, FS10N (Layout), FBL3N customer no not picking line layout

In that perticuler GL account Sort key also assign Customer no but line layout cutomer field is there but not pick the customer no

Pl help this issue

Regards

KSP