Does anyone know if I should check convergent validity and discriminant validity for a one-factor solution EPA ?

#1
As people know that the discriminant validity is calculated by using square-root value of AVE to compare with inter-construct correlation values. If I only have one construct in a variable, there is no any subdimension in a construct, how can I calculate the inter-construct correlation with different constructs, or check the construct reliability (C.R) values and average variance extracted (AVE) of each subdimension?