Template and ABAP code

Question

Hi ppl,
I am a bit confused.If i have to make some field to only 'display'(so that the user has no choice to edit),how can i do it?
-Who provides these templates??These templates that we publish are written in ABAP,right?
-Can we create our own templates and publish??
**When they say,change the template or change the ABAP code..what does it mean?Because to check the templates we goto SE80 and to change the code/add a field/edit a field--we go to SE11.Please let me know the link between SE11 and SE80 or the difference.
Many Thanks
Sam

Answer 1

Sam,
Before changing a template please go through following,it may resolve your issue -
In this BAdI you can change the screen variant that controls the display of the item overviews and search results. As default, the following screen variants are called up:
· Item data overview in the invoice without purchase order reference: Screen variant BBP_IV_NON_PO
Method GET_SCREENVARIANT_INV
· Item data overview in the invoice with purchase order reference: Screen variant BBP_IV
Method GET_SCREENVARIANT_INV
· Item data overview in the confirmation: Screen variant BBP_CF
Method GET_SCREENVARIANT_CONF
· Item data overview in the confirmation for time recording: Screen variant BBP_CF_TIMEREC
Method GET_SCREENVARIANT_CONF
· Item data overview in the purchase order: Screen variant BBP_PO
Method GET_SCREENVARIANT_PO
· Item overview for contracts: Screen variant BBP_CTR_ITEMLIST
Method GET_SCREENVARIANT_CTR
· Item overview for contract selection: Screen variant BBP_CTR_ITEM_SELLIST
Method GET_SCREENVARIANT_CTR
· Search results for creating an invoice and/or confirmation: Screen variant BBP_SEARCH_PO
Method GET_SCREENVARIANT_SEARCH
· Search results for creating a purchase order: Screen variant BBP_SEARCH_SC
Method GET_SCREENVARIANT_SEARCH
· Search results for displaying/changing an invoice: Screen variant BBP_CHANGE_IV
Method GET_SCREENVARIANT_SEARCH
· Search results for displaying/changing a confirmation: Screen variant BBP_CHANGE_CF
Method GET_SCREENVARIANT_SEARCH
· Item overview for creating/displaying/processing/status of a shopping cart: Screen variant BBP_SC
Method GET_SCREENVARIANT_SC
· Worklist for Sourcing: Screen variant BBP_SOCO_WL
Method GET_SCREENVARIANT_SOCO
· Work area in Sourcing: Screen variant BBP_SOCO_GA
Method GET_SCREENVARIANT_SOCO
Activities
If you wish to hide or show fields, proceed as follows: 
1. Determine the screen variant, for example, BBP_IV, using the list above.
2. Copy this screen variant, for example, in ZZ_BBP_IV_1, in Transaction SHD0.
3. Change the new screen variant as required. Note that you can only change the display properties for fields of table controls. You can switch the display on and off (column Invisible in Transaction SHD0). You can recognize the fields of a table control because they have a 1 on the right side of the first column. In addition, the heading for this area contains (Table CTRL.
4. Implement the appropriate method (see the list above). Fill the export parameter EV_SCVARIANT with the new screen variant.
You can create multiple screen variants for a screen and then select these in the BAdI depending on the user or on other criteria.
Thanks and Warm Regards.
Pras