[Help]Field Mapping does not show all fields

[SEANCHEN0611]

Hi there, 

I am new to ArcGis Pro. I am doing field mapping at the moment.

I have a line with around 30 fileds in the attributes table please see the attached figure1. However, I cannot see all fields that showing on attirbutes table in the field mapping please see the attached figure 2.

This results that I cannot successfully mapping values to some fields that are not showing in the attached figure 2.

Please help if you know any of this, and thanks in advance.

Figure 1

Figure 2

[Scott_Harris]

In the Field Mapping dialog, your source layer is 'SWP'. I can't really guess what's going wrong since I don't know the schema of the target layer 'swMain'. My best guess is the data types don't match (ex. Text vs Float)