Field help (AMKTYPMSK) 

The screen is firstly defined by its type, which can be :

The first 3 type (header, tab, dialogue box) requires the additional entry of the number of lines and number of columns by remembering that the title of the tabs takes 1 line, the contour of the sections takes 1/2 a line by feature and that the maximum is 28 lines, 112 columns (88 columns, if there is a left list).

These two fields (lines, columns) are considered as being parameterization : a modification carried out by the specific/custom therefore does not required protection by activity code.